Abstract Expressionism emerged in post-World War II America, reflecting the era's anxiety and existential questioning. This movement shifted the art world's center from Paris to New York, emphasizing spontaneous brushwork and non-objective forms on large-scale canvases. Key artists like Jackson Pollock, Willem de Kooning, and Mark Rothko pioneered techniques such as action painting and color field painting. Their work challenged traditional notions of art, emphasizing individual expression and the artist's unique vision.