In 1887, president grover cleveland signed the dawes severalty act mainly in order to

B  assimilate Native Americans into white culture.

Explanation:

A  keep track of Native American tribe populations.

B  assimilate Native Americans into white culture.

C  increase the size of Native American reservations.

D  supports the Native American culture.

Instead of looking back on the “historical past,” they will opine that the dominant culture was once “assimilated” by indigenous populations and new immigrants. To be assimilated meant dressing, speaking, and behaving in a white manner, as well as assimilating to white cultural norms.