Select two correct causes of U.S. involvement in World War II. The United States becomes the leading military and economic power in the world. The United Stầtes suffers from the devastating economic depression The United States abandons isolationism and adopts a policy of internationalism The United States learns of a secret alliance between Japan and the Soviet Union The United States wants to defend democracy from fascism and militarism The United States acquires new territorial possessions. D The United States is attacked by Japan at Pearl Harbor.