It has been the same story everywhere Google. There was a time when people were treated much worse in the U.S. We had to fight a civil war to stop it and even then it took another hundred years to finally end it.
We can't change man's inhumanity overnight. But there is something that would help, in my view.
The civilized nations of the world should create - or at lease contribute financing to - a secret force with the sole purpose of assassinating dictators who rule by force. Let the world know that if you take control by any means other than popular election, or rule autocratically denying basic human rights, you will be shot dead.
The U.S. has tried to help but often we arm one side so that it can overthrow evil, only to see evil replaced by evil. Just shoot the leaders as fast as they arise, wherever they arise, and over time the people will take control.