The answer to this is African Americans.
Back around World War II they mostly pay attention to the war so the whole racism left African Americans alone because around that time they didn't quite care for that too much because they mostly want to keep on the whole war thing. Around that time the U.S was just about getting ready to get involved.
Hope this helped :)
Have a great day
The American Revolution was a radical revolution that was motivated by the call for liberty, equality and respect for natural rights that ultimately ended with the Declaration of Independence, which sought to create a society that could serve as a model of freedom for the rest of the world.