After WWII, the world saw the first artistic movement born in the U.S.A., named Abstract Expressionism.

 (Jackson Pollock)

(Jane Frank)

The movement was welcomed as the first real American avant-garde, matured during the Thirties, all artists influenced by the Great Depression, social realism and the Regionalist movement. 

 (Aaron Siskind, photograph)

 

 (F. Depero)