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The racial segragation of African-Americans from European-Americans still existed during WW I, even in the armed forces. On the American side, African Americans were segregated from White Americans.
The US Military was officially segregated (for African Americans) from the beginning of the United States until about 1947.
When the U.S. was segregated, MLB was segregated for partly the same reason, not allowing African-Americans to play and forcing them into the Negro Leagues.
It kept them away from the Americans who didn't like African Americans.
Because they wanted to keep African Americans and whites segregated.
Facilities for African Americans were of poorer quality.
Yes, albeit in segregated units.
Jim Crow
Facilities for African Americans were of poorer quality.
Jim Crow laws kept African Americans and whites from mixing in the South in public places.
SIT-IN
The volunteers were formed into segregated units with white officers.