History of Native Americans

In the videos, History of Native Americans, what key issues were given for the fall of the Indian nations?
https://www.screencast.com/t/RZkZkp6p4oj
https://www.screencast.com/t/l1ABmnsWil
https://www.screencast.com/t/Z949Iraf
https://www.screencast.com/t/pSxBvR0e

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