What was the most influential art movement of the 20th century?

The most influential art movement of the 20th century is arguably Abstract Expressionism. This movement, which began in the 1940s, was the first to gain international recognition and was a major influence on later movements such as Pop Art, Minimalism, and Conceptual Art. Abstract Expressionism was characterized by large, gestural brushstrokes, intense colors, and a focus on the artist's emotional and psychological state. It was also the first movement to be embraced by the commercial art world, which helped to spread its influence.