Your Question what was America's contribution to twentieth century architecture?

the architecture of the United States includes a wide variety of architectural styles over its history. architecture in the U.S. is regionally diverse and has been shaped by many external forces, and can therefore be said to be eclectic, something unsurprising in such a multicultural society. the United States is a relatively young country, and the overriding theme of American Architecture is modernity, with the 20th century skyscr as its ultimate symbol.