What did the United States do in 1863 that caused violent conflict with the Nez Perce?
They began to auction off Nez Perce lands to the highest bidders.
They asked some Nez Perces to give up lands occupied by other Nez Perces.
They attacked Nez Perce tribes to allow settlers access to gold on tribal lands.
They entered Nez Perce land to educate tribal children in American ways.