lol u kids do put ur homework out here like someones gonna give you an A+ answer lol.......it was because it has to do with slavery...the white man that came to America tried putting Mexicans and Indians 2work as slaves when they fought back and wouldn't do it the white man from Europe didn't like it there fore resulting in enslaving the black man there fore resulting in the black man rebelling and causing the civil war....that's the super short to the point version....put the rest in and voila you have a A+ paper