with the entry of the united states into the great war in 1917, african americans were eager to show their patriotism in hopes of being recognized as full citizens. however, they were barred from the marines and served only in menial roles in the navy. they were able to serve in all branches of the army except for the aviation units.
i believe you answer is going to be great britain. or the united kingdom.
depending on the time period your referring to!
good luck! i hope this is right!