Which of the following group won the right to vote last?
A felons
B women
C 18-21 years old
D southern blacks

Ithink the answer you are looking for is (b).

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.