Joseph forgave his brothers and lead them to Egypt where they wouldn't starve from the famine that was plagueing the Hebrews at the time. Who consequently wound up as slaves to the Pharohs. But even then it wasn't a sin that caused God to bring on the seven plagues, it was disobedience to God. When God says for you to do something you do it,,,. If God would have told the Confederacy to release their slaves most God fearing men would have done it, those who did would suffer the Wrath of God which I personnaly wish not to experience.