The war was fought because America was built upon slavery. During the Industrial Age, the northern economy no longer needed slavery. The south however was wasn’t ready nor was trying as hard to give up its dependency on slavery. The south economy would plummet and life for southerners would drastically make a down spiral if they couldn’t have access to expensive but efficient workers you never had to pay for.
What are the questions ? I might be able to help you if you tell me what they are
They did it because Hitler was strong, they did not want to start another world war, and they did not want people to die unnecessarily.
Hope this helps, Kam