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The Northeast megalopolis, also known as the Northeast Corridor, Acela Corridor, Boston–Washington corridor, BosWash, or BosNYWash, is the most populous
megalopolis A megalopolis () or a supercity, also called a megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough ...
exclusively within the United States, with slightly over 50 million residents as of 2022. The nickname "BosWash" for the region was first used by futurist Herman Kahn in a 1967 essay. It is the world's largest megalopolis by economic output. Located primarily on the Atlantic Coast in the
Northeastern United States The Northeastern United States (also referred to as the Northeast, the East Coast, or the American Northeast) is List of regions of the United States, census regions United States Census Bureau. Located on the East Coast of the United States, ...
, the Northeast megalopolis extends from the northern suburbs of
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
to Washington, D.C., running roughly southwesterly along a section of U.S. Route 1,
Interstate 95 Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...
, and the
Northeast Corridor The Northeast Corridor (NEC) is an electrified railroad line in the Northeast megalopolis of the United States. Owned primarily by Amtrak, it runs from Boston in the north to Washington, D.C., in the south, with major stops in Providence, Rhod ...
train line. It is sometimes defined more broadly to include other urban regions, including the Richmond and
Hampton Roads Hampton Roads is a body of water in the United States that serves as a wide channel for the James River, James, Nansemond River, Nansemond, and Elizabeth River (Virginia), Elizabeth rivers between Old Point Comfort and Sewell's Point near whe ...
regions to the south;
Portland, Maine Portland is the List of municipalities in Maine, most populous city in the U.S. state of Maine and the county seat, seat of Cumberland County, Maine, Cumberland County. Portland's population was 68,408 at the 2020 census. The Portland metropolit ...
, and
Manchester, New Hampshire Manchester is the List of municipalities in New Hampshire, most populous city in the U.S. state of New Hampshire. Located on the banks of the Merrimack River, it had a population of 115,644 at the 2020 United States census, 2020 census. Manches ...
, to the north; and
Harrisburg, Pennsylvania Harrisburg ( ; ) is the capital city of the U.S. commonwealth of Pennsylvania and the seat of Dauphin County. With a population of 50,099 as of 2020, Harrisburg is the ninth-most populous city in Pennsylvania. It is the larger of the two pr ...
, to the west. The region includes many of the nation's most populated metropolitan areas, including those of
New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...
,
Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
, Washington, D.C.,
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
and
Baltimore Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-large ...
. As of 2020, it contained more than 50 million people, about 17% of the U.S. population on less than 2% of the nation's land area, with a population density of about 1,000 people per square mile (390 people/km2), far more than the U.S. average of 80.5 per square mile (31 people/km2). At least one projection estimates the area will grow to 58.1 million people by 2025. Before the term "Megalopolis" became widely used, Walter Hedden identified the growing interdependence of large cities in the Northeast in his 1929 book, specifically regarding the sourcing of milk.  French
geographer A geographer is a physical scientist, social scientist or humanist whose area of study is geography, the study of Earth's natural environment and human society, including how society and nature interacts. The Greek prefix "geo" means "earth" a ...
Jean Gottmann then popularized the term "megalopolis" in his 1961 study of the region, ''Megalopolis: The Urbanized Northeastern Seaboard of the United States''. Gottmann concluded that the region's cities, while discrete and independent, are uniquely tied to each other through the intermeshing of their suburban zones, taking on some characteristics of a single, massive city: a ''megalopolis'', a term he co-opted from an ancient Greek town of the same name that named itself out of aspirations to become the largest Greek city.


Region

The Northeast megalopolis includes many of the financial and political centers of influence in the
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
, including the national capital of Washington, D.C., and all or part of 12 states (from north to south):
Maine Maine ( ) is a U.S. state, state in the New England region of the United States, and the northeasternmost state in the Contiguous United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Provinces and ...
,
New Hampshire New Hampshire ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Massachusetts to the south, Vermont to the west, Maine and the Gulf of Maine to the east, and the Canadian province of Quebec t ...
,
Massachusetts Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...
,
Rhode Island Rhode Island ( ) is a state in the New England region of the Northeastern United States. It borders Connecticut to its west; Massachusetts to its north and east; and the Atlantic Ocean to its south via Rhode Island Sound and Block Is ...
,
Connecticut Connecticut ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Rhode Island to the east, Massachusetts to the north, New York (state), New York to the west, and Long Island Sound to the south. ...
, New York,
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
,
Pennsylvania Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...
,
Delaware Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
,
Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It borders the states of Virginia to its south, West Virginia to its west, Pennsylvania to its north, and Delaware to its east ...
,
West Virginia West Virginia is a mountainous U.S. state, state in the Southern United States, Southern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States.The United States Census Bureau, Census Bureau and the Association of American ...
, and
Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...
. The region is linked by
Interstate 95 Interstate 95 (I-95) is the main north–south Interstate Highway on the East Coast of the United States, running from U.S. Route 1 (US 1) in Miami, Florida, north to the Houlton–Woodstock Border Crossing between Maine and the ...
and U.S. Route 1, which start in
Miami Miami is a East Coast of the United States, coastal city in the U.S. state of Florida and the county seat of Miami-Dade County, Florida, Miami-Dade County in South Florida. It is the core of the Miami metropolitan area, which, with a populat ...
and
Key West, Florida Key West is an island in the Straits of Florida, at the southern end of the U.S. state of Florida. Together with all or parts of the separate islands of Sigsbee Park, Dredgers Key, Fleming Key, Sunset Key, and the northern part of Stock Islan ...
, respectively, in the south, and terminate in Maine at the U.S.-Canadian border. It is also linked by the
Northeast Corridor The Northeast Corridor (NEC) is an electrified railroad line in the Northeast megalopolis of the United States. Owned primarily by Amtrak, it runs from Boston in the north to Washington, D.C., in the south, with major stops in Providence, Rhod ...
train line, the country's busiest passenger rail line, serving
Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
and several commuter rail agencies. The development of the interconnected urban corridor in the Northeast initially followed the strategic placement of these rail lines, forming a "railroad spine" before the expansion of the highway systems (such as I-95 and Route 1) and overlapping suburban areas. As of 2019, the region is home to 52.3 million people, and its metropolitan statistical areas are contiguous from Washington, D.C., in the south to
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
in the north. The region is not uniformly populated between the terminal cities, and there are regions nominally within the corridor yet located away from the main transit lines that have been bypassed by urbanization, such as the Quiet Corner in Connecticut. The region accounts for over 20% of the U.S.
gross domestic product Gross domestic product (GDP) is a monetary measure of the total market value of all the final goods and services produced and rendered in a specific time period by a country or countries. GDP is often used to measure the economic performanc ...
. It is home to two of the world's largest stock exchanges, the
New York Stock Exchange The New York Stock Exchange (NYSE, nicknamed "The Big Board") is an American stock exchange in the Financial District, Manhattan, Financial District of Lower Manhattan in New York City. It is the List of stock exchanges, largest stock excha ...
and
Nasdaq The Nasdaq Stock Market (; National Association of Securities Dealers Automated Quotations) is an American stock exchange based in New York City. It is the most active stock trading venue in the U.S. by volume, and ranked second on the list ...
, and the headquarters of the United Nations in New York City, and the executive, legislative, and judicial centers of the U.S. federal government, the
White House The White House is the official residence and workplace of the president of the United States. Located at 1600 Pennsylvania Avenue Northwest (Washington, D.C.), NW in Washington, D.C., it has served as the residence of every U.S. president ...
, the U.S. Capitol, and the U.S. Supreme Court in Washington, D.C. The region also is home to the headquarters of most of the nation's and some of the world's largest media organizations, including ABC, NBC, CBS, NPR, PBS, Fox,
Comcast Comcast Corporation, formerly known as Comcast Holdings,Before the AT&T Broadband, AT&T merger in 2001, the parent company was Comcast Holdings Corporation. Comcast Holdings Corporation now refers to a subsidiary of Comcast Corporation, not th ...
,
The New York Times Company The New York Times Company is an American mass media corporation that publishes ''The New York Times'' and its associated publications such as ''The New York Times International Edition'' and other media properties. The New York Times Company's ...
, ''
USA Today ''USA Today'' (often stylized in all caps) is an American daily middle-market newspaper and news broadcasting company. Founded by Al Neuharth in 1980 and launched on September 14, 1982, the newspaper operates from Gannett's corporate headq ...
'', ''
New York Post The ''New York Post'' (''NY Post'') is an American Conservatism in the United States, conservative daily Tabloid (newspaper format), tabloid newspaper published in New York City. The ''Post'' also operates three online sites: NYPost. ...
'', ''
The Wall Street Journal ''The Wall Street Journal'' (''WSJ''), also referred to simply as the ''Journal,'' is an American newspaper based in New York City. The newspaper provides extensive coverage of news, especially business and finance. It operates on a subscriptio ...
'', ''
Newsday ''Newsday'' is a daily newspaper in the United States primarily serving Nassau and Suffolk counties on Long Island, although it is also sold throughout the New York metropolitan area. The slogan of the newspaper is "Newsday, Your Eye on LI" ...
'', ''
The Washington Post ''The Washington Post'', locally known as ''The'' ''Post'' and, informally, ''WaPo'' or ''WP'', is an American daily newspaper published in Washington, D.C., the national capital. It is the most widely circulated newspaper in the Washington m ...
'', and ''
The Boston Globe ''The Boston Globe,'' also known locally as ''the Globe'', is an American daily newspaper founded and based in Boston, Massachusetts. The newspaper has won a total of 27 Pulitzer Prizes. ''The Boston Globe'' is the oldest and largest daily new ...
''. The global
headquarters Headquarters (often referred to as HQ) notes the location where most or all of the important functions of an organization are coordinated. The term is used in a wide variety of situations, including private sector corporations, non-profits, mil ...
of many major financial firms, including
JPMorgan Chase JPMorgan Chase & Co. (stylized as JPMorganChase) is an American multinational financial services, finance corporation headquartered in New York City and incorporated in Delaware. It is List of largest banks in the United States, the largest ba ...
,
Citigroup Citigroup Inc. or Citi (Style (visual arts), stylized as citi) is an American multinational investment banking, investment bank and financial services company based in New York City. The company was formed in 1998 by the merger of Citicorp, t ...
,
Goldman Sachs The Goldman Sachs Group, Inc. ( ) is an American multinational investment bank and financial services company. Founded in 1869, Goldman Sachs is headquartered in Lower Manhattan in New York City, with regional headquarters in many internationa ...
,
Morgan Stanley Morgan Stanley is an American multinational investment bank and financial services company headquartered at 1585 Broadway in Midtown Manhattan, New York City. With offices in 42 countries and more than 80,000 employees, the firm's clients in ...
,
Fannie Mae The Federal National Mortgage Association (FNMA), commonly known as Fannie Mae, is a United States government-sponsored enterprise (GSE) and, since 1968, a publicly traded company. Founded in 1938 during the Great Depression as part of the New ...
,
Freddie Mac The Federal Home Loan Mortgage Corporation (FHLMC), commonly known as Freddie Mac, is an American publicly traded, government-sponsored enterprise (GSE), headquartered in Tysons, Virginia.Capital One, The Vanguard Group, and
Fidelity Fidelity is the quality of faithfulness or loyalty. Its original meaning regarded duty in a broader sense than the related concept of '' fealty''. Both derive from the Latin word , meaning "faithful or loyal". In the City of London financial m ...
, are located in the region. Among the world's 500 largest companies, 54 are based in the Northeast megalopolis. Among the 500 largest U.S.-based companies, 162 are headquartered in the region. The region is the center of the global
hedge fund A hedge fund is a Pooling (resource management), pooled investment fund that holds Market liquidity, liquid assets and that makes use of complex trader (finance), trading and risk management techniques to aim to improve investment performance and ...
industry, which is heavily based in New York City and the suburban Connecticut cities of
Greenwich Greenwich ( , , ) is an List of areas of London, area in south-east London, England, within the Ceremonial counties of England, ceremonial county of Greater London, east-south-east of Charing Cross. Greenwich is notable for its maritime hi ...
and Stamford. The Northeast megalopolis is home to hundreds of colleges and universities, including several that rank among the world's most elite universities, including
Harvard Harvard University is a private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher lear ...
and MIT, both in
Cambridge, Massachusetts Cambridge ( ) is a city in Middlesex County, Massachusetts, United States. It is a suburb in the Greater Boston metropolitan area, located directly across the Charles River from Boston. The city's population as of the 2020 United States census, ...
,
Brown Brown is a color. It can be considered a composite color, but it is mainly a darker shade of orange. In the CMYK color model used in printing and painting, brown is usually made by combining the colors Orange (colour), orange and black. In the ...
in
Providence, Rhode Island Providence () is the List of capitals in the United States, capital and List of municipalities in Rhode Island, most populous city of the U.S. state of Rhode Island. The county seat of Providence County, Rhode Island, Providence County, it is o ...
, Yale in
New Haven, Connecticut New Haven is a city of the U.S. state of Connecticut. It is located on New Haven Harbor on the northern shore of Long Island Sound. With a population of 135,081 as determined by the 2020 United States census, 2020 U.S. census, New Haven is List ...
, Columbia in New York City, Princeton in
Princeton, New Jersey The Municipality of Princeton is a Borough (New Jersey), borough in Mercer County, New Jersey, United States. It was established on January 1, 2013, through the consolidation of the Borough of Princeton, New Jersey, Borough of Princeton and Pri ...
, the
University of Pennsylvania The University of Pennsylvania (Penn or UPenn) is a Private university, private Ivy League research university in Philadelphia, Pennsylvania, United States. One of nine colonial colleges, it was chartered in 1755 through the efforts of f ...
in
Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
,
Johns Hopkins Johns Hopkins (May 19, 1795 – December 24, 1873) was an American merchant, investor, and philanthropist. Born on a plantation, he left his home to start a career at the age of 17, and settled in Baltimore, Maryland, where he remained for mos ...
in
Baltimore Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-large ...
, and Georgetown in Washington, D.C.


Population


Economy

The total GDP of the Northeast megalopolis is $5.6 trillion, of which around $2.3 trillion is from the
New York metropolitan area The New York metropolitan area, also called the Tri-State area and sometimes referred to as Greater New York, is the List of cities by GDP, largest metropolitan economy in the world, with a List of U.S. metropolitan areas by GDP, gross metropo ...
. As of 2023, the Northeast megalopolis would have the third-highest GDP of any nation if it was its own country, ahead of
Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
($4.7 trillion).


History

Due to its proximity to
Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
, the Eastern coast of the United States was among the first regions of the continent to be widely
settled A settler or a colonist is a person who establishes or joins a permanent presence that is separate to existing communities. The entity that a settler establishes is a settlement. A settler is called a pioneer if they are among the first settli ...
by Europeans. Over time, the cities and towns founded on the East Coast had the advantage of age over most other parts of the U.S. However, it was the Northeast in particular that developed most rapidly, owing to a number of fortuitous circumstances. While possessing neither particularly rich soil—one exception being New England's Connecticut River Valley—nor exceptional mineral wealth, the region still supports some
agriculture Agriculture encompasses crop and livestock production, aquaculture, and forestry for food and non-food products. Agriculture was a key factor in the rise of sedentary human civilization, whereby farming of domesticated species created ...
and
mining Mining is the Resource extraction, extraction of valuable geological materials and minerals from the surface of the Earth. Mining is required to obtain most materials that cannot be grown through agriculture, agricultural processes, or feasib ...
. The
climate Climate is the long-term weather pattern in a region, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteoro ...
is temperate and not particularly prone to
hurricane A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its ...
s or
tropical storm A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its lo ...
s, which increase further
south South is one of the cardinal directions or compass points. The direction is the opposite of north and is perpendicular to both west and east. Etymology The word ''south'' comes from Old English ''sūþ'', from earlier Proto-Germanic ''*sunþa ...
. However, the most important factor was the "interpenetration of land and sea," which makes for exceptional harbors, such as those at the
Chesapeake Bay The Chesapeake Bay ( ) is the largest estuary in the United States. The bay is located in the Mid-Atlantic (United States), Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula, including parts of the Ea ...
, the Port of New York and New Jersey, Narragansett Bay in
Providence, Rhode Island Providence () is the List of capitals in the United States, capital and List of municipalities in Rhode Island, most populous city of the U.S. state of Rhode Island. The county seat of Providence County, Rhode Island, Providence County, it is o ...
, and Boston Harbor. The coastline to the north is rocky and little sheltered, whereas to the south it is smooth and does not feature as many bays or inlets that might function as natural harbors. Also featured are navigable
river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...
s that lead deeper into the heartlands, such as the Hudson,
Delaware Delaware ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic and South Atlantic states, South Atlantic regions of the United States. It borders Maryland to its south and west, Pennsylvania to its north, New Jersey ...
, and
Connecticut Connecticut ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Rhode Island to the east, Massachusetts to the north, New York (state), New York to the west, and Long Island Sound to the south. ...
rivers, which all support large populations and were necessary to early settlers for development. Therefore, while other parts of the country exceeded the region in raw resource value, they were not as easily accessible, and often, access to them necessarily had to pass through the Northeast first.


Modern history

The Northeast played a significant role in the foundation of the United States during the late colonial era and in the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
. Pre-revolutionary events like the ''Gaspee'' affair, the Boston Massacre,
Boston Tea Party The Boston Tea Party was a seminal American protest, political and Mercantilism, mercantile protest on December 16, 1773, during the American Revolution. Initiated by Sons of Liberty activists in Boston in Province of Massachusetts Bay, colo ...
, and the
First Continental Congress The First Continental Congress was a meeting of delegates of twelve of the Thirteen Colonies held from September 5 to October 26, 1774, at Carpenters' Hall in Philadelphia at the beginning of the American Revolution. The meeting was organized b ...
all occurred in the region. In 1775, the
Battles of Lexington and Concord The Battles of Lexington and Concord on April 19, 1775 were the first major military actions of the American Revolutionary War between the Kingdom of Great Britain and Patriot (American Revolution), Patriot militias from America's Thirteen Co ...
, the first major battle of the Revolution, occurred in
Massachusetts Massachusetts ( ; ), officially the Commonwealth of Massachusetts, is a U.S. state, state in the New England region of the Northeastern United States. It borders the Atlantic Ocean and the Gulf of Maine to its east, Connecticut and Rhode ...
a few miles away from
Boston Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...
. Many of the most significant battles took place in the region, including the Battle of Bunker Hill, the Battle of Monmouth, the Battle of Trenton, the Battle of Princeton, as well as several significant military campaigns such as the Philadelphia Campaign, the
New York and New Jersey Campaign The New York and New Jersey campaign in 1776 and the winter months of 1777 was a series of American Revolutionary War battles for control of the Port of New York and New Jersey, Port of New York and the state of New Jersey, fought between Kingdom ...
, the Boston Campaign, and the Yorktown Campaign. The surrender of the British occurred in the south end of the megalopolis after the Siege of Yorktown in 1781. Other significant events that occurred during the Revolution at this time in the region include the
Second Continental Congress The Second Continental Congress (1775–1781) was the meetings of delegates from the Thirteen Colonies that united in support of the American Revolution and American Revolutionary War, Revolutionary War, which established American independence ...
, the creation of the
Articles of Confederation The Articles of Confederation, officially the Articles of Confederation and Perpetual Union, was an agreement and early body of law in the Thirteen Colonies, which served as the nation's first Constitution, frame of government during the Ameri ...
, the signing of the
Declaration of Independence A declaration of independence is an assertion by a polity in a defined territory that it is independent and constitutes a state. Such places are usually declared from part or all of the territory of another state or failed state, or are breaka ...
, and the Constitutional Convention. During the
Civil War A civil war is a war between organized groups within the same Sovereign state, state (or country). The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies.J ...
, while most of the region did not experience fighting, there were many significant battles in the southern end of the region, particularly in
Virginia Virginia, officially the Commonwealth of Virginia, is a U.S. state, state in the Southeastern United States, Southeastern and Mid-Atlantic (United States), Mid-Atlantic regions of the United States between the East Coast of the United States ...
. Major battles such as the Battle of Gettysburg, the Battle of Antietam, the Battles of Bull Run, the
Battle of Fredericksburg The Battle of Fredericksburg was fought December 11–15, 1862, in and around Fredericksburg, Virginia, in the Eastern Theater of the American Civil War. The combat between the Union Army, Union Army of the Potomac commanded by Major general ( ...
, the Battle of Chancellorsville, and the Battles of Petersburg all occurred in the region. Additionally, Richmond acted as the capital of the Confederacy. In 1800, the region included the only three U.S. cities with populations of over 25,000:
Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...
,
New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...
, and
Baltimore Baltimore is the most populous city in the U.S. state of Maryland. With a population of 585,708 at the 2020 census and estimated at 568,271 in 2024, it is the 30th-most populous U.S. city. The Baltimore metropolitan area is the 20th-large ...
. By 1850, New York City and Philadelphia alone had over 300,000 residents while Baltimore, Boston,
Brooklyn Brooklyn is a Boroughs of New York City, borough of New York City located at the westernmost end of Long Island in the New York (state), State of New York. Formerly an independent city, the borough is coextensive with Kings County, one of twelv ...
(at that time a separate city from New York),
Cincinnati Cincinnati ( ; colloquially nicknamed Cincy) is a city in Hamilton County, Ohio, United States, and its county seat. Settled in 1788, the city is located on the northern side of the confluence of the Licking River (Kentucky), Licking and Ohio Ri ...
, and
New Orleans New Orleans (commonly known as NOLA or The Big Easy among other nicknames) is a Consolidated city-county, consolidated city-parish located along the Mississippi River in the U.S. state of Louisiana. With a population of 383,997 at the 2020 ...
had over 100,000: five were within one 400-mile strip while the last two were each four hundred miles away from the next closest metropolis. The immense concentration of people in one relatively densely packed area gave that region considerable sway through population density over the rest of the nation, which was solidified in 1800 when Washington, D.C., only 38 miles southwest of Baltimore, was made the nation's capital. According to Gottmann, capital cities "will tend to create for and around the seats of power a certain kind of built environment, singularly endowed, for instance, with monumentality, stressing status and ritual, a trait that will increase with duration." The
transport Transport (in British English) or transportation (in American English) is the intentional Motion, movement of humans, animals, and cargo, goods from one location to another. Mode of transport, Modes of transport include aviation, air, land tr ...
ation and
telecommunications Telecommunication, often used in its plural form or abbreviated as telecom, is the transmission of information over a distance using electronic means, typically through cables, radio waves, or other communication technologies. These means of ...
infrastructure that the capital city mandated also spilled over into the rest of the strip. Additionally, the proximity to Europe, as well as the prominence of Ellis Island as an immigrant processing center, made New York City and cities nearby a "landing
wharf A wharf ( or wharfs), quay ( , also ), staith, or staithe is a structure on the shore of a harbour or on the bank of a river or canal where ships may dock to load and unload cargo or passengers. Such a structure includes one or more Berth (mo ...
for European immigrants," who represented an ever replenished supply of diversity of thought and determined workers. By contrast, the other major source of trans-oceanic immigrants was
China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...
, which was farther from the U.S. West Coast than Europe was from the East, and whose ethnicity made them targets of
racial discrimination Racial discrimination is any discrimination against any individual on the basis of their Race (human categorization), race, ancestry, ethnicity, ethnic or national origin, and/or Human skin color, skin color and Hair, hair texture. Individuals ...
, creating barriers to their seamless integration into American society. By 1950, the region held over one-fifth of the total U.S. population, with a density nearly 15 times that of the national average. The region has been home to the richest city in the nation for over 200 years:
Hartford, Connecticut Hartford is the List of capitals in the United States, capital city of the U.S. state of Connecticut. The city, located in Hartford County, Connecticut, Hartford County, had a population of 121,054 as of the 2020 United States census, 2020 ce ...
held the title from the pre–
Civil War A civil war is a war between organized groups within the same Sovereign state, state (or country). The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies.J ...
industrial era until about 1929, and
New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...
has held it since. Loudoun and Fairfax County, Virginia are the wealthiest counties in the country, and Connecticut's Gold Coast has one of the highest population densities of families worth over $30 million USD.


Concept

The concept of megalopolises originated with Jean Gottmann, a French geographer who wrote ''Megalopolis'', a book whose central theory was that the cities between Washington, D.C., and Boston together form a sort of cohesive, integrated "supercity." He took the term
megalopolis A megalopolis () or a supercity, also called a megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough ...
from a small Greek town that was settled in the
Classical Era Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural European history between the 8th century BC and the 5th century AD comprising the interwoven civilization ...
with the hope it would "become the largest of the Greek cities". The city still exists today, but is largely a sleepy agricultural community. However, the dream of the city's founders, Gottmann argued, was being realized in the Northeastern U.S. in the 1960s with the ascent of the region to global political, academic, and economic prominence. Gottmann defined two criteria for a group of cities to be a true megalopolis: "polynuclear structure" and "manifold concentration"—that is, the presence of multiple urban nuclei, which exist independently of each other yet are integrated in a special way relative to sites outside their area. Twin cities, such as Minneapolis–Saint Paul in
Minnesota Minnesota ( ) is a U.S. state, state in the Upper Midwestern region of the United States. It is bordered by the Canadian provinces of Manitoba and Ontario to the north and east and by the U.S. states of Wisconsin to the east, Iowa to the so ...
, are not usually considered to form megalopolitan areas since in most cases, the two cities have become integrated enough that they effectively function as one single city in various ways, even though they may have distinct city borders and distinct central business districts. Large communities on the outskirts of major cities, such as Bethesda in
Maryland Maryland ( ) is a U.S. state, state in the Mid-Atlantic (United States), Mid-Atlantic region of the United States. It borders the states of Virginia to its south, West Virginia to its west, Pennsylvania to its north, and Delaware to its east ...
(outside of Washington, D.C.) and Camden in
New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...
(outside of Philadelphia), may be clearly distinct areas with even their own
downtown ''Downtown'' is a term primarily used in American and Canadian English to refer to a city's sometimes commercial, cultural and often the historical, political, and geographic heart. It is often synonymous with its central business district ( ...
s. However, they tend to be independent of their host cities in few, if any, ways, still being considered suburbs or lesser cities that almost certainly would not have developed in the ways that they have without their host cities' presence. On the other hand, while the major cities of the Northeast megalopolis all are distinct, independent cities, they are closely linked by transportation and telecommunications. Neil Gustafson showed in 1961 that the vast majority of phone calls originating in the region terminate elsewhere in the region, and it is only a minority that are routed to elsewhere in the United States or abroad. In 2010 automobiles carried 80% of Boston-Washington corridor travel; intercity buses 8–9%;
Amtrak The National Railroad Passenger Corporation, Trade name, doing business as Amtrak (; ), is the national Passenger train, passenger railroad company of the United States. It operates intercity rail service in 46 of the 48 contiguous United Stat ...
6%; and airlines 5%. Business ventures unique to the region have sprung up that capitalize on the interconnectedness of the megalopolis, such as airline shuttle services that operate short flights between Boston and New York City and New York City and Washington, D.C. that leave every half-hour, Amtrak's
Acela Express The ''Acela'' ( ; originally the ''Acela Express'' until September 2019) is Amtrak's flagship passenger train service along the Northeast Corridor (NEC) in the Northeastern megalopolis, Northeastern United States between Washington, D.C. and ...
high-speed rail service from Washington to Boston, and the Chinatown bus lines, which offer economy transportation between the cities' Chinatowns and elsewhere. Other bus lines operating in the megalopolitan area owned by national or international corporations have also appeared, such as BoltBus and Megabus. These ventures indicate not only the dual "independent nuclei"/"interlinked system" nature of the megalopolis, but also a broad public understanding of and capitalization on the concept. In 2007, Gottmann's "megalopolis" concept was largely supported by John Rennie Short, who authored an update to Gottmann's book, ''Liquid City: Megalopolis and the Contemporary Northeast''.
National Geographic Society The National Geographic Society, headquartered in Washington, D.C., United States, is one of the largest nonprofit scientific and educational organizations in the world. Founded in 1888, its interests include geography, archaeology, natural sc ...
released a map in 1994 of the region at the time of the
American Revolutionary War The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence, was the armed conflict that comprised the final eight years of the broader American Revolution, in which Am ...
and in present day, which borrowed Gottmann's book's title. U.S. Senator Claiborne Pell wrote a book, ''Megalopolis Unbound'' in 1966, which summarized and expanded on Gottman's original book to outline his vision for a cohesive transportation policy in the region, including his state of Rhode Island. In 1967, futurists Herman Kahn and Anthony Wiener coined the term " BosWash" to predict that the region would emerge as the sort of megalopolis initially described by Gottmann.


See also

*
Megalopolis A megalopolis () or a supercity, also called a megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough ...
* BosWash *
Conurbation A conurbation is a region consisting of a number of metropolises, cities, large towns, and other urban areas which, through population growth and physical expansion, have merged to form one continuous urban or industrially developed area. In most ...
*
East Coast of the United States The East Coast of the United States, also known as the Eastern Seaboard, the Atlantic Coast, and the Atlantic Seaboard, is the region encompassing the coast, coastline where the Eastern United States meets the Atlantic Ocean; it has always pla ...
* Megaregions of the United States * Metropolitan statistical area *
Mid-Atlantic (United States) The Mid-Atlantic is a List of regions of the United States, region of the United States located in the overlap between the nation's Northeastern United States, Northeastern and Southeastern United States, Southeastern states. Traditional definitio ...
*
Northeast Corridor The Northeast Corridor (NEC) is an electrified railroad line in the Northeast megalopolis of the United States. Owned primarily by Amtrak, it runs from Boston in the north to Washington, D.C., in the south, with major stops in Providence, Rhod ...
*
Northeastern United States The Northeastern United States (also referred to as the Northeast, the East Coast, or the American Northeast) is List of regions of the United States, census regions United States Census Bureau. Located on the East Coast of the United States, ...
* Quebec City–Windsor Corridor, a densely populated corridor in Canada


References


Sources

* ** Republished as


External links

{{Northeast US Megapolitan areas of the United States
Megalopolis A megalopolis () or a supercity, also called a megaregion, is a group of metropolitan areas which are perceived as a continuous urban area through common systems of transport, economy, resources, ecology, and so on. They are integrated enough ...