The South was invaded to set up a gigantic corrupt centralized government,central banking,corporate welfare,income taxes,etc... In other words, all of the problem s that plague the U.S.A. today.The Constitution was violated multiple times by Lincoln such as suspending habeous corpus, horrible attacking of citizens in both North and the south. Lincoln was a dictator and the only good thing he accomplished was freeing the slaves.The secessionists wanted secession, and were willing to risk war to get it. They thought it a small risk because, in their self-centered arrogance, they had convinced themselves that the people of the free states lacked the will to fight and/or the courage and ability to defeat them. They were wrong.