Large numbers of people settled on the great plains because
a. the passage of the homestead act.
b. the beginning of the depression.
c. the use of steam tractors.
d. the consolidation of farms.

The correct answer is - D. the consolidation of farms.

Large masses of people moved into the Great Plains after the situation with the agricultural land was sorted out. Once the consolidation of the farms was finished, people were eager to move into this region because they saw a great opportunity to get large amounts of land, to be economically more independent, and become large land owners and with it to make a significant wealth. Some of the people that moved in here were people that moved from the eastern part of the country, but there was also a huge migration wave coming from Europe from which most of the people settled in here.

each played a major role in ending the cold war.