Buzzfeed has a gallery of 17 photographs taken between 1937 and 1943 illustrating how segregated the U.S. used to be. Blacks and whites had separate water fountains, restrooms, movie theaters, diners, overnight accommodations, and pretty much everything else. However, there are a couple of signs indicating that both "white and colored" were served. Link
(Image credit: Marion Post Wolcott/Library of Congress)