<span>It was not an actual railroad. It was a network of houses and buildings that were used to help slaves escape from the South to freedom in the Northern states or Canada.</span>
Jamestown settlement is the answer for this problem
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
From my research it was ancient Greece. But not 100 hundred percent true