There are many issues but here are a few.
Foreign policy, Homeland Security, Drugs, Healthcare, Tax reform and social security.
If you need more let me know.
Answer: They gained all of that because they had the manpower and modern weapons to do it. People in Africa at the time didn't really have much.
The Union's industrial and economic capacity soared during the war as the North continued its rapid industrialization to suppress the rebellion. In the South, a smaller industrial base, fewer rail lines, and an agricultural economy based upon slave labor made mobilization of resources more difficult.
