American artists became internationally important with their new vision and new artistic vocabulary, known as Abstract Expressionism. movement of abstract painting that emerged in New York City during the mid-1940s and attained singular salience in American art in the following decade; also called action painting and the New York school.

Although Abstract Expressionism included array of stylistic approaches, several unifying themes were present in the movement. Abstract Expressionist oil paintings consisted of shapes, lines, and forms meant to create a separate reality from the  world.

Abstract expressionism presented as sum of stylistic multiformity within its largely, though not exclusively, nonrepresentational framework

Abstract Expressionists saw oil painting as a pure expression of emotion and means of visual communication. Not all Abstract Expressionist work was abstract and expressive, although the movement is united in its voluntary release of unconscious creativity. The act of painting is advised as significant as the finished product itself.