I would have made a treaty with them stating that the reservations werent need they could have moved to a different part of their land and they could have avoided the violence.
Chivalry. It's not really behavior so much as "I'm more powerful than you and I want your daughter, give me your daughter or I'll kill you", but your history teacher will want the answer chivalry, so I suggest you answer that, lol.
Two of the major factors that contributed to Russia’s war difficulties during WWII were political infighting and the fact that they were fighting the large majority of the war and suffering by far the worst casualties.