Answer:
C. People of different races had prominent roles in the movement.
The United States economic foreign policy made them successful and prosperous because they had agood combination of isolationist practices which enabled them to not spend money on useless wars or conflicts while at the same time engaging in trade with various nations.
B is the correct answer because the Emancipation Proclamation did not free all slaves in the United States.
Rather, it declared free only those slaves living in states not under Union control. The proclamation declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free." It applied only to states that had seceded from the United States, leaving slavery untouched in the loyal border states. It also expressly exempted parts of the Confederacy (the Southern secessionist states) that had already come under Northern control.
