An art movement, primarily in painting, that originated in the US in the 1940s and remained strong through the 50's. Artists working on many different styles emphasized spontaneous expression in large paintings that were abstract and nonrepresentational is called

Abstract expressionism.

Explanation:

This art movement has Paul Jackson Pollock as the most well-known abstract expressionist. Pollock is an American artist who painted what he really wanted to express in every painting although everyone might think different because of how "visually messy" his paintings were.

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