Things eventually got better for both Native Americans and African-Americans, but they got much worse first. Until the revolution, there was far less land taken from the Native Americans, and also fewer slave states. Eventually, we abolished slavery though. I am not sure things really got better for Native Americans when they got reservations though.
I think it's pretty hard to say that it was revolutionary in a good way for either of these groups. The British tended to try to keep the colonists restrained when it came to relations with the Indians. They tried to keep the colonists from moving out into Indian lands (Proclamation of 1763, for example) so they wouldn't have to pay to defend them. That restraint went away after the Revolution.
The revolutionaries didn't really (as a group) care much about non-whites and so they did not have any plans to set up a new system that would benefit either of these groups.
The revolution was a big benefit to African Americans because more than 50,000 slaves gained their freedom after the war in the north, that number more than doubled by 1800. . .Why did the war affect slavery and actually account for its decline in many parts of the North? Why was the reaction in the South where slavery became more entrenched so different? Do you think the white Americans should have seen this sign of trouble to come, with the brand new country already divided over the issue of slavery?