What events contributed to the advent of Abstract Expressionism

Abstract Expressionism is a post-World War 2 art movement in American painting, developed in New York in the 1940s. It was the first specifically American movement to achieve international influence and put New York City at the center of the western art world, a role formerly filled by Paris. Although the term "abstract expressionism" was first applied to American art in 1919 by the art critic Robert Coates, it had been first used in Germany in 1919 in the magazine Der Sturm, regarding German Expressionism. It the United States, Alfred Barr was the first to use this term in 1929 in relation to works by Wassily Kandinsky.

Explanation:

the longest time is 123 years