"WE THE PEOPLE" Popular sovereignty or the authority of the people referenced in the Preamble of the Constitution - This principle states that government power comes from the consent of the governed (the citizens). One is example of popular sovereignty is the election of representatives and senators in which the citizens hold the vote to elect the legislatures the citizens favor.
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I do not think the settlers were justified in expanding west, because the territory was already claimed by the Native Americans. I do understand the promise the promise that was made, but the settlers had no right to try to settle in the west.
Archival research &a Oral history are two ways.
And then there is epistemology and historiography<span>.</span>
