text: The idea that there anything morally wrong with slavery was a new idea introduced in the West by some radical Christian groups a few centuries ago, and that eventually spread and prevailed. Before that, it existed in many societies around the world at many periods of history, and was just accepted as a normal social institution. It is still accepted in some  cultures.
  
  As for "the Indian Problem", it was how to get a preliterate culture integrated into the modern, literate, agricultural and industrial world, when one had no experience in how to do it and had to figure it out from scratch. People naturally used what they thought worked, e.g. boarding schools and physical and mental discipline, etc.