Basically, it is a struggle between the state government and the national government, which is reflected in the slave issue. The United States has two congressmen, and the United States Senate also has two congressmen. However, the newer States are not allowed to own slaves, which leads to the decline of political rights in southern States. When Lincoln was elected president, the south finally thought that slavery would be banned in any country, so it declared independence, because the United States was originally independent from Britain, and when States joined the union, they thought they could quit at any time.

The final impact, the most important thing is to finally solve a problem-if there is a conflict between countries, which is the priority? The victory of the Federation gave a clear answer to this question-the country. At present, the United States is single, and before the Civil War it was multi-people. In addition, with the end of the civil war, the United States has been unified. For blacks, they took the first step on the road to freedom-although they were released, they were greatly discriminated against in the following 100 years.