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Hitler's power was not checked when the US entered the war. The war with the US was between them and Japan. The USSR did join sides with the allies when Germany broke an treaty. However, the US did win the war between Japan.
In general, President Abraham Lincoln appointed Ulysses S. Grant to lead the Union armies after firing other generals because "<span>C. Grant was willing to outlast the enemy even at the cost of high casualties"</span>
Going back to free 300 more slaves after she made it to the northern states.