Americana are artifacts, or a collection of artifacts, related to the history, geography, folklore and cultural heritage of the United States. Defined as materials and things concerning or characteristic of The United States of America; broadly, its culture.
National identity, historical context, patriotism and nostalgia play defining roles in the subject. The ethos, or guiding beliefs or ideals that characterize America, such as The American Dream are central to the idea.
"The United States of America is such as glorious mess of contradiction, such a crazy quilt of competing themes, such a fecund mishmash of people and ideas, that defining us is pretty much pointless. There is, of course, a kind of faded notion of "Americana", one that concerns Route 66, diners, freak rock formations, and the like - but even in it's halcyon days this "roadside attraction" version of America was never an accurate of nuanced distillation of our massively compicated culture.
There are scenes and places, wattages and personages, that belong - inextricably, unmistakably - to this country alone. There is an American quality, a tone, an energy...instantly recognizable..." 
"It’s no accident that my first novel was called Americana. This was a private declaration of independence, a statement of my intention to use the whole picture, the whole culture. America was and is the immigrant's dream, and as the son of two immigrants I was attracted by the sense of possibility that had drawn my grandparents and parents." (From Conversations With Don Delillo)
Many kinds of material fall within the definition of Americana:The things involved need not be old, but need to have the appropriate associations. Each historical period of United States history is reflected by the advertising and marketing of the time, and these types of antiques, collectables, and vintage items are typical of what you would find as Americana.
The Atlantic described the term as "slang for the comforting, middle-class ephemera at your average antique store—things like needle-pointed pillows, Civil War daguerreotypes, and engraved silverware sets".
Americana music is contemporary music that incorporates elements of various American roots music styles, including country, roots-rock, folk, bluegrass and blues, resulting in a distinctive roots-oriented sound.
From the mid through late 20th Century, Americana was largely associated with nostalgia for an idealized life in small towns and small cities in America around the turn of the century, from roughly 1880 to the First World War, popularly considered "The Good Old Days". It was believed that much of the structure of 20th Century American life and culture had been cemented in that time and place.
Henry Seidel Canby wrote:
"It is the small town, the small city, that is our heritage. We have made twentieth-century America from it, and some account of these communities as they were ... we owe our children and grandchildren."
The nostalgia for this period was based on a remembrance of confidence in American life in this period that was due to such factors as a sense that the Frontier had been "conquered" with the US Census Bureau's declaration that it was "closed" in 1890, as well as the recent victory in the Spanish–American War.
As Canby put it,
Americans at this time "really believed all they heard on the Fourth of July or read in school readers. They set on one plane of time, and that the present, the Declaration of Independence, the manifest destiny of America, the new plumbing, the growth of the factory system, the morning paper, and the church sociable. It was all there at once, better than elsewhere, their own, and permanent. ... They had just the country they wanted...and they believed it would be the same, except for more bathtubs and faster trains, forever ... for the last time in living memory everyone knew exactly what it meant to be an American."
The zeitgeist of the idealized period is captured in the Disneyland-style theme parks' Main Street, U.S.A. section (which was inspired by both Walt Disney's hometown of Marceline, Missouri and Harper Goff's childhood home of Fort Collins, Colorado), as well as the musical and movie The Music Man and Thornton Wilder's stage play Our Town. Especially revered in Americana nostalgia are small town institutions like the barber shop, the drug store/soda fountain and ice cream parlor, the latter which would be resurrected by mid-twentieth century nostalgia for this time period in businesses like the Farrell's Ice Cream Parlour chain with its 1890s theme.
"At the soul of every Harley-Davidson is something hard to explain. But easy to understand once you're on one. It's a strong attraction that has to do with pride, style and a powerful piece of Americana." (from 1987 Harley Davidson Advertisement)
Americana aside, people like white picket fences for a couple of practical reasons.
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