The development of the American art form known as abstract

expressionism in the 1950s

I assume you are asking to know about abstract expressionism

Answer and Explanation:

Abstract expressionism is an American art movement that began in the late 1940s after World War II. It began in New York and became dominant in 1950s. Abstract expressionism was a form of painting that emphasized feeling and emotions in painting characterized by spontaneity in colors, and shapes. Some of the notable pioneers and abstract expressionist artists were Jackson Pollock, Willem de Kooning, Franz Kline, and Mark Rothko. Others included Joan Mitchell, Clyfford Still, Philip Guston, Helen Frankenthaler, Barnett Newman, Adolph Gottlieb, Robert Motherwell.

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