Historically US did not treat Native Americans with the same attitude as it did with other foreign countries. The colonists initially got help from Native Americans when they first arrived. But when they expanded their territories, they began hostile actions against Native Americans. They took over all of North American and left very little lands as reservations for Native. Americans. US treated the European countries and even Canada and Mexico with much more respects.
The U.S. thought that Native Americans were dirty and unclean. They made them act,learn and behave like commen U.S. citizens because they were concerned about the younger Native Americans. The U.S often thinks that other cultures in foren places are dirty and unclean. For example (not trying to offend anyone) India. In history books we learn India is a dirty ruel place where stds run ramped. Im reality it is just a diffrent way of living. However, the U.S does not force other foren cultures to integrat into ours.
The Dred Scottt case increased sectional tension because he attempted to sue for citizenship, and the decision was that black men could not and would not ever be granted citizenship