During World War II many African Americans stayed in the US and helped the war effort in non-combative war, although some fought in segregated units in battle.
False. The correct answer would be Imperialism.
That is because theories of environmental determinism often led to racism and eugenics because it was believed that psychology and physiology of people varied due to their location, which meant that other races were different from us, and it was mostly used as an excuse to treat them as inferior.