It would be "Whether a new state or territory should enter the Union as Free or Slave" that had the most impact on the Civil War, since the North was strongly against the spread of slavery, while the South was in favor of it.
Answer:
In 1865 President Andrew Johnson implemented a plan of Reconstruction that gave the white South a free hand in regulating the transition from slavery to freedom and offered no role to blacks in the politics of the South.
Explanation:
The amount of African Americans holding public office rose.
Some of the reasons that global migrations occurred in the 1750-1900 time period were forced labor, poverty,hope for jobs, work-related things, and for safety.