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The Inter-American Treaty of Reciprocal Assistance (commonly known as the Rio Treaty, the Rio Pact, the Treaty of Reciprocal Assistance, or by the
Spanish-language Spanish () or Castilian () is a Romance languages, Romance language of the Indo-European languages, Indo-European language family that evolved from the Vulgar Latin spoken on the Iberian Peninsula of Europe. Today, it is a world language, gl ...
acronym TIAR from ''Tratado Interamericano de Asistencia Recíproca'') is an intergovernmental
collective security Collective security is arrangement between states in which the institution accepts that an attack on one state is the concern of all and merits a collective response to threats by all. Collective security was a key principle underpinning the Lea ...
agreement signed in 1947 in
Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...
at a meeting of the American states. The central principle contained in its articles is that an attack against one is to be considered an attack against them all; this was known as the "hemispheric defense" doctrine. Despite this, several members have breached the treaty on multiple occasions. The treaty was initially created in 1947 and came into force in 1948, in accordance with Article 22 of the treaty.
The Bahamas The Bahamas, officially the Commonwealth of The Bahamas, is an Archipelagic state, archipelagic and island country within the Lucayan Archipelago of the Atlantic Ocean. It contains 97 per cent of the archipelago's land area and 88 per cent of ...
was the most recent country to sign and ratify it in 1982.


Background

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 ...
maintained a hemispheric defense policy relative to European influence under the
Monroe Doctrine The Monroe Doctrine is a foreign policy of the United States, United States foreign policy position that opposes European colonialism in the Western Hemisphere. It holds that any intervention in the political affairs of the Americas by foreign ...
from 1823 onward, and became increasingly interventionist following the 1904 promulgation of the
Roosevelt Corollary In the history of United States foreign policy, the Roosevelt Corollary was an addition to the Monroe Doctrine articulated by President Theodore Roosevelt in his 1904 State of the Union Address, largely as a consequence of the Venezuelan cri ...
. During the 1930s the United States had been alarmed by
Axis An axis (: axes) may refer to: Mathematics *A specific line (often a directed line) that plays an important role in some contexts. In particular: ** Coordinate axis of a coordinate system *** ''x''-axis, ''y''-axis, ''z''-axis, common names ...
overtures suggesting military cooperation with Latin American governments; apparent strategic threats against the
Panama Canal The Panama Canal () is an artificial waterway in Panama that connects the Caribbean Sea with the Pacific Ocean. It cuts across the narrowest point of the Isthmus of Panama, and is a Channel (geography), conduit for maritime trade between th ...
were of particular concern. These were discussed in a series of meetings of the International Conference of American States and at the 1936 Inter-American Conference for the Maintenance of Peace.Act of Chapultepec
''The Oxford Companion to World War II'', 2001, I. C. B. Dear and M. R. D. Foot
During
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
, the American government had been able to secure support for the
Allies An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not an explicit agreement has been worked out among them. Members of an alliance are calle ...
from all individual governments in the Americas except
Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...
(which remained neutral until 22 February 1945) and
Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...
(which had difficult relations with the Allied powers from 1944 to 1945 but declared war on the Axis on 27 March 1945). Some countries had signed the
Declaration by United Nations The Declaration by United Nations was the main treaty that formalized the Allies of World War II and was signed by 47 national governments between 1942 and 1945. On 1 January 1942, during the Arcadia Conference in Washington D.C., the Allied " B ...
in early 1942 and more had signed by the end of 1945. However, Latin American countries were largely sidelined from the Allied discussions of a postwar security order, held at
Dumbarton Oaks Dumbarton Oaks, formally the Dumbarton Oaks Research Library and Collection, is a historic estate in the Georgetown neighborhood of Washington, D.C. It was the residence and gardens of wealthy U.S. diplomat Robert Woods Bliss and his wife ...
from August to October 1944. The Brazilian Ambassador to Washington, Carlos Martins Pereira e Souza, "protested the violation of inter-American norms of consultation in the preparation of postwar plans." These protests led to a series of consultations as well as to a Mexican proposal for an inter-American meeting. At the Inter-American Conference on the Problems of War and Peace, at
Chapultepec Castle Chapultepec Castle () is located on top of Chapultepec Hill in Mexico City's Chapultepec park. The name ''Chapultepec'' is the Nahuatl word which means "on the hill of the grasshopper". It is located at the entrance to Chapultepec park, at a he ...
in
Mexico City Mexico City is the capital city, capital and List of cities in Mexico, largest city of Mexico, as well as the List of North American cities by population, most populous city in North America. It is one of the most important cultural and finan ...
during February and March 1945, discussions of the post-war world order were held by the US Secretary of State and by the foreign secretaries of all the Latin American countries except El Salvador and Argentina, resulting in the Act of Chapultepec of 6 March 1945. The Act included a framework for the negotiation of a regional security treaty. It also shaped Latin American pressure during the United Nations conference in San Francisco for clauses in the UN Charter to facilitate regional collective defense, under Article 51. Initially, the security conference was planned to be held in Rio de Janeiro in October 1945 but it was postponed to March 1946. The March 1946 date was also postponed indefinitely. Disputes between the United States and Argentina's
Juan Perón Juan Domingo Perón (, , ; 8 October 1895 – 1 July 1974) was an Argentine military officer and Statesman (politician), statesman who served as the History of Argentina (1946-1955), 29th president of Argentina from 1946 to Revolución Libertad ...
(President from 4 June 1946) led to the delays. The American concern, alongside that of some countries in South America regarding
Peronism Peronism, also known as justicialism, is an Argentine ideology and movement based on the ideas, doctrine and legacy of Juan Perón (1895–1974). It has been an influential movement in 20th- and 21st-century Argentine politics. Since 1946, P ...
raised the possibility of including collective intervention to preserve democracy in the security conference. During the delay, global tensions between the United States and Soviet Union grew. In light of the developing
Cold War The Cold War was a period of global Geopolitics, geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc, which lasted from 1947 unt ...
and following the statement of the
Truman Doctrine The Truman Doctrine is a Foreign policy of the United States, U.S. foreign policy that pledges American support for democratic nations against Authoritarianism, authoritarian threats. The doctrine originated with the primary goal of countering ...
on 12 March 1947, the United States wished to make those new anti-communist commitments permanent, as did many anti-communist leaders in Latin America. The following year, in 1948, delegates gathered in
Bogotá Bogotá (, also , , ), officially Bogotá, Distrito Capital, abbreviated Bogotá, D.C., and formerly known as Santa Fe de Bogotá (; ) during the Spanish Imperial period and between 1991 and 2000, is the capital city, capital and largest city ...
,
Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...
, where they passed the charter of the
Organization of American States The Organization of American States (OAS or OEA; ; ; ) is an international organization founded on 30 April 1948 to promote cooperation among its member states within the Americas. Headquartered in Washington, D.C., United States, the OAS is ...
(OAS). The OAS was created to oversee different functions beyond defense. The OAS functioned through debate and voting instead of the like-mindedness that characterized
NATO The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
.


History


Signing

The Inter-American Treaty of Reciprocal Assistance was the first of many so-called "mutual security agreements", and the formalization of the Act of Chapultepec. The treaty was adopted by the original signatories on 2 September 1947 in
Rio de Janeiro Rio de Janeiro, or simply Rio, is the capital of the Rio de Janeiro (state), state of Rio de Janeiro. It is the List of cities in Brazil by population, second-most-populous city in Brazil (after São Paulo) and the Largest cities in the America ...
(hence the colloquial name "Rio Treaty"). It came into force on 3 December 1948 and was registered with the
United Nations The United Nations (UN) is the Earth, global intergovernmental organization established by the signing of the Charter of the United Nations, UN Charter on 26 June 1945 with the stated purpose of maintaining international peace and internationa ...
on 20 December 1948. With the exceptions of
Trinidad and Tobago Trinidad and Tobago, officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean, comprising the main islands of Trinidad and Tobago, along with several List of islands of Trinidad and Tobago, smaller i ...
(1967) and
the Bahamas The Bahamas, officially the Commonwealth of The Bahamas, is an Archipelagic state, archipelagic and island country within the Lucayan Archipelago of the Atlantic Ocean. It contains 97 per cent of the archipelago's land area and 88 per cent of ...
(1982), no countries that became independent after 1947 have joined the treaty;
Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...
is yet to become a member, though it already has separate defense commitments with the United States.


Cold War

As revolutionary and nationalist governments spread through Latin America through the 1950s and 1960s, the fear of a shared enemy that was experienced during WWII dissipated and the idea of defensive cooperation became strained. According to Slater, many Latin American governments participating in the Treaty sought "to insulate the hemisphere from rather than involve it in world conflict", though the United States pushed the smaller countries towards confrontation with its ideological adversaries. Latin American governments then began to view inter-American collaboration as bending to the will of the United States, forfeiting their sovereignty. In 1962 American states had found it necessary to break diplomatic relations with the Government of Cuba. The Report of the Inter-American Peace Committee to the Eighth Meeting of Consultation of Ministers of Foreign Affairs suggested that the activity the countries of the Sino-Soviet bloc and the Cuban government had with America was described as a serious violation of fundamental principles of the inter-American system. Though the Cold War overtones of the Rio Treaty became increasingly evident, during the immediate post-war years, Long argues that it was more closely tied to pre-WWII regional antecedents and, even, Latin American diplomatic pressure. Long states, "Despite many Latin American concerns about the United States' ultimately interventionist nature, Latin American diplomats cited the Monroe Doctrine and United States-led Pan-Americanism in support of a grand bargain that would extend and institutionalize US engagement while restricting unilateralism." However, the United States' often considered adherence to the Treaty's principles of nonintervention as secondary to its Cold War concerns. Though the action of the United States during the 1954 Guatemalan coup d'état and the 1961
Bay of Pigs Invasion The Bay of Pigs Invasion (, sometimes called or after the Playa Girón) was a failed military landing operation on the southwestern coast of Cuba in April 1961 by the United States of America and the Cuban Democratic Revolutionary Front ...
raised questions among Latin American governments, the unilateral approach of the United States invading the
Dominican Republic The Dominican Republic is a country located on the island of Hispaniola in the Greater Antilles of the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean. It shares a Maritime boundary, maritime border with Puerto Rico to the east and ...
in 1965 during the
Dominican Civil War The Dominican Civil War (), also known as the April Revolution (), took place between April 24, 1965, and September 3, 1965, in Santo Domingo, Dominican Republic. It started when civilian and military supporters of the overthrown democraticall ...
, before the OAS's Inter-American Peace Force was organized, caused many members to believe that the United States did not respect the ideals of
multilateralism In international relations, multilateralism refers to an alliance of multiple countries pursuing a common goal. Multilateralism is based on the principles of inclusivity, equality, and cooperation, and aims to foster a more peaceful, prosperous, an ...
. Conversely during the
Falklands War The Falklands War () was a ten-week undeclared war between Argentina and the United Kingdom in 1982 over two British Overseas Territories, British dependent territories in the South Atlantic: the Falkland Islands and Falkland Islands Dependenci ...
in 1982, the United States favored the
United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...
arguing that Argentina had been the aggressor and because Argentina had not been attacked, as did Chile and Colombia. This was seen by most Latin American countries as the final failure of the treaty. Due to this, by the beginning of 1988 sixteen Latin American countries had become full members of the Nonaligned Movement, while another eight countries were observers and supported to different extents. The sixteen countries were Argentina, Belize, Bolivia, Chile, Colombia, Cuba, Ecuador, Grenada, Guyana, Jamaica, Nicaragua, Panama, Peru, St. Lucia, Suriname, and Trinidad-Tobago. The eight that supported were Barbados, Brazil, Costa Rica, Dominica, El Salvador, Mexico, Uruguay, and Venezuela.


21st century

During a speech he made on 7 September 2001, the Mexican president, Vicente Fox Quesada, pointed out the necessity of having a multidimensional and modern security structure that responds to the real needs of the American hemisphere. He pointed out that when the TIAR was created in 1947 it was a result of the conditions from World War II. Since then it has been overtaken by a global system in which the vulnerability of nations does not lie solely in military or ideological threats. In September 2002, citing the Falklands example and anticipating the
invasion of Iraq An invasion is a military offensive of combatants of one geopolitical entity, usually in large numbers, entering territory controlled by another similar entity, often involving acts of aggression. Generally, invasions have objectives ...
,
Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...
formally withdrew from the treaty; after the requisite two years, in September 2004, Mexico ceased to be a signatory. In 2008, the
Union of South American Nations The Union of South American Nations (USAN), sometimes also referred to as the South American Union, abbreviated in Spanish as UNASUR and in Portuguese as UNASUL, is an intergovernmental regional organization. It was set up by Hugo Chavez to ...
(UNASUR) created a new regional security council to manage their own defensive objectives. On 5 June 2012,
Bolivarian Alliance for the Americas ''Alba'' ( , ) is the Scottish Gaelic name for Scotland. It is also, in English-language historiography, used to refer to the polity of Picts and Scottish people, Scots united in the ninth century as the Kingdom of Alba, until it developed ...
(ALBA) countries
Bolivia Bolivia, officially the Plurinational State of Bolivia, is a landlocked country located in central South America. The country features diverse geography, including vast Amazonian plains, tropical lowlands, mountains, the Gran Chaco Province, w ...
,
Ecuador Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contain ...
,
Nicaragua Nicaragua, officially the Republic of Nicaragua, is the geographically largest Sovereign state, country in Central America, comprising . With a population of 7,142,529 as of 2024, it is the third-most populous country in Central America aft ...
, and
Venezuela Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many Federal Dependencies of Venezuela, islands and islets in the Caribbean Sea. It com ...
, under the leadership of leftist governments, initiated the retirement from the TIAR, a decision which the
Obama administration Barack Obama's tenure as the 44th president of the United States began with his first inauguration on January 20, 2009, and ended on January 20, 2017. Obama, a Democrat from Illinois, took office following his victory over Republican nomine ...
described as "unfortunate" but respected. The treaty was officially denounced by Nicaragua on 20 September 2012, Bolivia on 17 October 2012, Venezuela on 14 May 2013, and Ecuador on 19 February 2014.


Invocations and considerations

The treaty was invoked numerous times during the 1950s and 1960s, in particular the unanimous support of the United States' naval blockade during the
Cuban Missile Crisis The Cuban Missile Crisis, also known as the October Crisis () in Cuba, or the Caribbean Crisis (), was a 13-day confrontation between the governments of the United States and the Soviet Union, when American deployments of Nuclear weapons d ...
. In 2001, 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 ...
invoked the Rio Treaty after the
September 11 attacks The September 11 attacks, also known as 9/11, were four coordinated Islamist terrorist suicide attacks by al-Qaeda against the United States in 2001. Nineteen terrorists hijacked four commercial airliners, crashing the first two into ...
. In 2019, during a presidential crisis in Venezuela between incumbent President
Nicolás Maduro Nicolás Maduro Moros (; born 23 November 1962) is a Venezuelan politician and former union leader serving as the 53rd president of Venezuela since 2013. Previously, he was the 24th Vice President of Venezuela, vice president from 2012 to 20 ...
and president of the opposition-led
National Assembly of Venezuela The National Assembly () is the federal legislature of the Bolivarian Republic of Venezuela, which was first elected in 2000 under the 1999 constitution. It is a unicameral body made up of a variable number of members, who are elected by a ...
Juan Guaidó Juan Gerardo Antonio Guaidó Márquez (born 28 July 1983) is a Venezuelan politician and opposition figure. He belonged to the social-democratic party Popular Will, and was a federal deputy to the National Assembly representing the state of V ...
, the latter opened talks on rejoining TIAR. On 11 May, Guaidó sent a letter to
Organization of American States The Organization of American States (OAS or OEA; ; ; ) is an international organization founded on 30 April 1948 to promote cooperation among its member states within the Americas. Headquartered in Washington, D.C., United States, the OAS is ...
(OAS) secretary Luis Almagro requesting that Venezuela be reinstated. On 29 May 2019, the National Assembly approved its return to the Treaty in a preliminary discussion. The National Assembly reiterated its approval to return to the treaty in July 2019. As in 2024, due to the result of the elections in Venezuela, citizens have been collecting signatures to activate the TIAR in view of the crisis being experienced, which is being viewed as fraud.


Members

Current members:


See also

*
Collective Security Treaty Organization The Collective Security Treaty Organization (CSTO, ) is an Intergovernmental organization, intergovernmental military alliance in Eurasia consisting of six post-Soviet states: Armenia, Belarus, Kazakhstan, Kyrgyzstan, Russia, and Tajikistan. Th ...
* Inter-American Peace Force *
North Atlantic Treaty Organization The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental transnational military alliance of 32 member states—30 European and 2 North American. Established in the aftermat ...
*
Military alliance A military alliance is a formal Alliance, agreement between nations that specifies mutual obligations regarding national security. In the event a nation is attacked, members of the alliance are often obligated to come to their defense regardless ...
* SICOFAA *
Mutual Defense Assistance Act The Mutual Defense Assistance Act was a United States Act of Congress signed by President Harry S. Truman on October 6, 1949. For U.S. foreign policy, it was the first U.S. military foreign aid legislation of the Cold War era, and initially to ...
* Mutual Security Act * Latin America–United States relations *
Inter-American Conference on Problems of War and Peace The Inter-American Conference on Problems of War and Peace informally known as the Chapultepec Conference, was held in Chapultepec Castle in Mexico City on February 21 to March 8, 1945, between the United States and 19 Latin America, Latin American ...
of 1945


Footnotes


Further reading

* Long, T. (2020). " Historical Antecedents and Post-World War II Regionalism in the Americas." ''World Politics''. *


References

{{DEFAULTSORT:Inter-American Treaty Of Reciprocal Assistance 20th-century military alliances 21st-century military alliances Cold War organizations Cold War alliances and military strategy Anti-communist organizations 1947 in Brazil 20th century in Rio de Janeiro September 1947 in North America Cuba–United States relations United States–South American relations Cold War treaties Military alliances involving the United States Treaties concluded in 1947 Treaties entered into force in 1948 Organization of American States treaties Treaties of Argentina Treaties of the Bahamas Treaties of the Second Brazilian Republic Treaties of Chile Treaties of Colombia Treaties of Costa Rica Treaties of Cuba Treaties of El Salvador Treaties of Guatemala Treaties of Haiti Treaties of Honduras Treaties of Panama Treaties of Paraguay Treaties of Peru Treaties of Trinidad and Tobago Treaties of the United States Treaties of Uruguay Treaties of the Dominican Republic International organizations based in the Americas September 1947 in South America