What was Literature and art of the world war one era like and the war's effect on the Lost Generation?

What was Literature and art of the world war one era like and the war's effect on the Lost Generation?
Pablo Picasso, the lost generation of Gertruide Stein, Ernest Hemingway, F. Scott Fitzgerald, Ezra Pound, Sherwood Anderson, Waldo Peirce, and John Dos Passos