Imperialism is basically a policy that extends a country's power and influence through a military force and/or a diplomacy.
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Their land was taken over, as was their food source, making it hard for them to survive. They did not have the same rights as Americans either until 1924. They were forced to live on reservations.
They always had small pox
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The film doesn't always improve the viewers understanding, the film could be lying that it's "based on real events". The film maker doesn't always know the real truth.