Some consider it to be racist
Answer:
it changed because the fire nation attacked, naw im just kidding, the real reason is becasue the government changed, and the warrior class began to run the country.
Explanation:
Manifest Destiny was the religiously affiliated idea that colonists were destined to move westward and expand the country they had just formed. This whole idea greatly affected Native Americans because the white men forced them off their land for several reasons like railroad construction, crops, mining and precious metals, and hundreds of other voluble resources. Andrew Jackson was the guy that was primarily at blame for the violence towards Native Americans. This lead to the trail of tears. The trail of tears happened because of invading Europeans expanding their land and railroad routes, forcing the Cherokees off of their land.
You have to be at least over 37/50 to know this type of stuff for me really help you out other than that i don’t have a clue