I always find it amusing when a supporter of a cause motivated by the perceived threat to the institution that kept a third of their population in bondage accuses someone else of tyranny.
It needed and had to be done away with, but it would have happened before 1900 without a bloody failed second war of Independence.
So another forty or fifty years of slavery was OK with you? Kind of hard on the slave, wasn't it?
How many people died and were wounded in America's Second War of Independence (aka the Civil War)?