The civil war is the bloodiest ever roughly 620,000 peopled died almost the most then every other war combined. There are many causes of the civil war. First the Mexican American War Wilmot Proviso tried to make a law where any land that Mexico got from the war would not allow them to have slaves it was banned but it failed and there was then the free soil party which people did not want for slavery to go west at all. Next there was the Compromise of 1850 which basically made it where California would become a free state. Uncle Tom's Cabin was another one this was book saying how bad slavery was Harriet Beecher Stowe sold around 300,000 books. Then there was the Kansas Nebraska Act they could vote if they want slavery or not. Last there was the Dred Scott v. Sanford this made it so no state was really free slaves were property so they could go with them anywhere. I don't think the Civil War could of been avoided because there was know other way to go about it there was to many people against each other.r.