Could it get any worse for the Native Americans?

Yes.

The Dawes Act offered U.S. citizenship to tribal members who accepted the individual allotments of land carved out of their territory, allotments that were held in trust by the government for 25 years. The Burke Act gave the Secretary of the Interior the power to decide if individual Native Americans were competent to handle their own affairs and merit citizenship. He could also decide who were worthy to become heirs to the land, because, obvs, Native Americans weren't capable of determining this by themselves without the helpful supervision of the U.S. government.