The difference is that the black people in the 1860s didn't
kill all the white people, well, cull them into an endangered species and then claim their stuff and land for there own. Walk out of their chains and kennels right into the Mansions and luxury where their masters used to rule from.
Of course what would the Indians do?
On one hand whiteys gone, so it seems like the perfect time to make a play to get their country back, on the other, the new ruling class just made soup out of a nation of cutthroat assholes who had murdered them to the brink and nicked 18 thousand cubic miles of dirt in the process.