Here's a short response specifically discussing the exploitation of the Native and black people in American history, still in 50 words: 

American history has been marred by the scars of the exploitation of marginalized groups, especially the black and Native American people. These can take the form of enslavement, land appropriation, forced assimilation, discrimination, segregation, mass incarceration, and more, and some might argue that the systemic oppression continues to this day.
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