Abstract Expressionism revolutionized American art after World War II, shifting focus from representation to emotion-driven, non-objective paintings. Emerging in New York City, this movement emphasized spontaneous brushwork and the expressive power of color and form, reflecting artists' inner thoughts and feelings. Key figures like Jackson Pollock, Willem de Kooning, and Mark Rothko pioneered innovative techniques such as drip painting and color field compositions. Their work established New York as the new art world center, symbolizing America's growing cultural confidence in the post-war era.