Answer:
It helped germany accomplishing its main objectives
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The 30.1.1933 He was chancellor but still Controlled by a other politicians. He Then Started to Change the laws so He could more easily Control Germany (e.g. He forbid other policial Parties). On the 2.8.1934 the President Hindenburg died and Hitler one day later decided that He would also be President now. Starting at that Point, He was Not Controlled any more.
Americans were tired of war and the US should end it quickly.