Men signed up by states. Served with fellows from the same state and fought as state units. Ever look at how both armies were composed. It was by state units not a national army. A lot if not the majority fought for their state as much as anything early in the war. Lee was offered command of the Union army but declined because he knew Virginia was not going to remain in the union. He was more loyal to his state than what many felt was a broken Federal system. Some feel that way today. Big states trying to dictate rule and law everywhere.