In 1941, Congress passed a law that allowed countries like Great Britain, China, and the Soviet Union to pay for aid with land or anything else the President deemed worthy.
In 1942, Executive Order 9066 was issued, which allowed any ethic group to be removed to a camp if they were deemed a threat by the government.
However, the only ones sent to internment camps were the Japanese, who did not pose a threat.
The Battle of Stalingrad is seen as the most important battle in WW2 by many historians. The Germans tried to invade Stalingrad because it was a large industrial city that, if taken over by the Germans, could be used to spread Hitler's propaganda. Eventually though, the Soviets surrounded the Nazis and won.
The Japanese easily spread across Chinese territory because of the conflict and mistrust between the Chinese Communists and Nationalists.
President Truman signed the order to drop the atomic bomb on Japan in 1945.
We'll show them!
After WW2 ended, the US and the Soviet Union developed distrust and started the Cold War.