It kept them away from the Americans who didn't like African Americans.
Facilities for African Americans were of poorer quality.
Jim Crow
SIT-IN
African Americans were still treated with discrimination and prejudice, so they served in racially segregated units.
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.
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.
SIT-IN
The volunteers were formed into segregated units with white officers.
SIT-IN
The Black Codes limited the freedoms of African-Americans, and that wasn't fair. The Black Codes pretty much segregated the African Americans from the Whites.