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People always talk about the oppression as ancient history, but it has been perpetual for many groups, not just limited to indigenous. Allotment ran until 1934, giving away native lands. After that they moved to Termination, where they tried to dissolve reservations and negate treaties.
The oldest federal park ranger in the US, who died recently, had a grandmother that was a slave.
We're just 2 generations away from 'ancient history'