What were the political, social, and economic goals of American expansionists?

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In 1893, historian Frederick Jackson Turner wrote that “American history has been the history of the conquest and colonization of the Great West.” Referring to specific events and trends, explain why and how American conquest and colonization of western lands took place. What were the political, social and economic goals of American expansionists? How did Americans’ desires for western lands (and Florida) lead to conflicts with foreign governments? What effects did western settlement have upon peoples who already inhabited these places, as well as those Americans who migrated into the West?