Modernism gained momentum in the early 20th century as an artistic movement that rejected traditional styles and emphasized innovation and experimentation to better reflect modern society. This was influenced by events like World War I, nationalism, and technological advances. Modern art movements from this period included Fauvism, Cubism, Expressionism, and Dadaism. These styles used abstraction and expressionism rather than realistic representation, and rejected the past by establishing new methods like individual artistic contribution and Wölfflin's principles of form. Modernism influenced existing art historical methods through psychoanalytic and formalist analyses.