The document summarizes the emergence and evolution of major art movements in New York City following World War II. It describes how the New York School of abstract expressionism arose as European artists immigrated to New York during the war. Artists like Jackson Pollock and Mark Rothko developed new styles of abstract expressionism using techniques like action painting and color field painting. In the 1960s, new movements like pop art, conceptual art, and op art emerged, experimenting with popular culture, ideas over objects, and optical illusions.