The entry of the United States into World War II caused vast changes in virtually every aspect of American life. ... Building on the economic base left after the war, American society became more affluent in the postwar years than most Americans could have imagined in their wildest dreams before or during the war.
It became a military superpower in the world but lacked a strong economy The reason for the non strong economy was due to the Great Depression, and financial crisis of the 1920's
