Abstract Expressionism was a post-World War II American art movement that originated in New York in the 1940s. It was the first American art movement to gain worldwide recognition and prominence, establishing New York City as the center of the global art world. Abstract Expressionism had two main streams - Action Painting in the late 1940s-1950s, characterized by impulsive, emotional brushwork, and Color Field and Hard-Edge Painting in the early 1960s, focused on large areas of color or geometric shapes. Major artists associated with the movement included Jackson Pollock, Willem de Kooning, Helen Frankenthaler, and Mark Rothko.