Over time, how did the nature of slavery change in america?

It abolished  and different races were beig slaved

Explanation:

Black people,and Native Americans have been slaved

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.