As a direct result of the u. s. entering world war i, which of these produced the most significant economic and social change to the u. s.?
a) there was a great increase in the number of labor union members.
b) african-americans migrated in large numbers to the north seeking job opportunities.
c) women began to enter the workforce in greater numbers and remained employed after the war.
d) the u. s. was able to alleviate signs of an economic depression because of wartime production.