Abstract Expressionism emerged in 1940s New York, shifting the art world's center from Paris. Artists like Jackson Pollock and Willem de Kooning broke from tradition, expressing raw emotions through non-objective forms in response to World War II's devastation. The movement emphasized spontaneity, large-scale canvases, and unconventional techniques. Action painting and color field painting became key styles, reflecting existentialist ideas and the anxieties of the post-war era. Abstract Expressionism's impact on modern art remains significant today.