The New Deal helped alleviate the Depression, but most historians agree that it did not end until and because of World War II.
Politically, the U.S. developed the idea that the government had an obligation to guarantee the social welfare of its people, an idea which went unchallenged until 2001. It also brought about a change in allegiance of political parties, with Afro-Americans voting for Democrats for the first time (although many of them went with Ike in 1952).
Economically the New Deal strengthened labor unions. It also gave great weight to Eduard Keynes's economic theories.