The U.S. military remained segregated during the war but over four million southern blacks migrated north, primarily to work in defence industries
Answer: Option D
Step-by-step explanation:
Black population from the South migrated and came to the mid west and the north east parts of United States of America. This was done by the Blacks to escape from the discrimination they were facing in the southern states while they ended up taking meagre and mediocre roles to support themselves during the second world war.
The U.S. military remained separated at the period of war but over 4 millions of southern blacks migrated to the north, primarily to do job in defense industries. This is one of the largest migration in terms of population.