To encourage the assimilation of American Indians is the right answer.
The Dawes Act of 1887 was named after Henry L. Dawes who served as the Senator of Massachusetts. He empowered the U.S. President to divide the landholdings of the Native Americans into allotments. The main purpose of this act was to assimilate Native American Indians into mainstream United States' society by destroying their social and cultural beliefs.
Appeasement in an international context is a diplomatic policy of making political or material concessions to an aggressive power in order to avoid conflict.