Did the decades of the 1930s and 1940s bring positive or negative changes to the United States?

Franklin Roosevelt and the new deal 1932-1941
world war 2 1941-1945
post-war prosperity and cold war fears 1945-1960
Did the decades of the 1930s and 1940s bring positive or negative changes to the United States? Be sure to discuss economic, political, and social changes in both decades.

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