Now, if you want to argue that slavery for an extra almost 100 years was not suffering then be my guest. I think both groups suffered and to some degree this had to do with the war. The Native American siding with the British certainly fed into the American psyche that they were 'the enemy' and deserved to be killed ... it excused the genocide that followed. If you are saying that they would have been treated exactly the same if they had sided with the Americans then what does that say about the sort of people the Americans were?
My opinion...
Slavery continued because people were greedy. Since we cannot guess what would have happened, we cannot say that slaves would not have been freed if they had risen against the British. Same thing with the American Indians. But, based upon the fact they fought a bloody civil war to end it, they would not have. That says they (The American British/Dutch/German/Irish/Spanish/French/Etc) were greedy bastards. Glad I am not decended from them....
The American British/Dutch/German/Irish/Spanish/French/Etc. who set out to tame the *west* and take away more land from the Indians did not care who they sided with in any war. They just wanted the land. They came in with land grants from politicians and pushed the Indians off (and killed them)....
What this says about the sort of people the Americans is the same thing it says about the William the Conq...Oh, I'll leave him out of the discussion.
It is the same principal. The guy with the bigger weapon, who knows how to use it and can gather more man power, wins.
I don't think the treatment of blacks and Indians had anything to do with the revolution. It just had to do with one group thinking they were better. There is too much historical evidence pointing in that direction. Even the dubs bought into it....
I am sure the same attitudes exist in other western countries. They just are loathe to let the secret escape lest they sound/be like America....