You did not mention Russia or South Africa
And you did not mention that America had slaves because the white colonialists were able to buy them from the English. And buy they did.
Just think, they could have complained about what was happening to the blacks there and then, but chose to purchase them instead. That they did of their own free will. Nobody forced them to buy them
And with the help of blacks they were able to steal the land from the original inhabitants. And the original inhabitants got to die
Anonymous wrote:He started a civil war he could have avoided
And everywhere else slavery was abolished peacefully.
History has just been made to look pretty
Well let's take a look at that:
Haiti: Revolution
Portugal: Banned by Monarch
Spain: Got kicked out of the New World
Germany: Hitler defeated
France: Slavery was abolished when Napoleon was defeated.
Denmark: Banned by Monarch
Romania: Half peaceful legislation, half during the revolution of 1848
Ethiopia: Banned by conquering Italians
West Indies: British legislation
To me, it looks like most abolition was accomplished either by revolution, imposed by a monarch, or the result of either a decree to a colony or the loss of a colony. That doesn't exactly reinforce your point.