African Americans who fought for the Union during the Civil War were not freed until after the war.
were usually led by African American officers.
had been recruited in border states.
were paid less than white soldiers.

This cartoon appeared in 1916. the topic of the cartoon isa)the reason for the start of world war i.b)the success of us submarines in world war i.c)the military alliance between germany and mexico.d)the attitude in the us towards submarine warfare in world