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Manifest Destiny: the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.

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Manifest Destiny should take place and be promoted because of the natural resources it provides and the protection from foreign competition/borders

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For one, California provided 163,696 mi² of land. The climate and soil of California provided well for agricultural institutions as well as quantities of timber to the north. Valuable minerals such as gold were also discovered in 1848. Most importantly, California provided a port of San Francisco, a vital connection to the pacific.
"However, westward expansion provided the United States with vast natural resources and ports along the Atlantic, Pacific and Gulf coasts for expanding trade, key elements in creating the superpower America is today." (http://www.historynet.com)

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"Such are the people who inhabit a country embracing four or five hundred miles of sea-coast, with several good harbors; with fine forests in the north; the waters filled with fish, and the plains covered with thousands of herds of cattle; blessed with a climate, than which there can be no better in the world; free from all manner of diseases, whether epidemic or endemic; and with a soil in which corn yields from seventy to eighty fold. In the hands of an enterprising people, what a country this might be!"

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"Capitalists and landholders, who feel in Europe the premonitions of coming evil are transferring their treasures to our funds, and making large investments in land, and facilitating emigration to augment the value of their property. Our unoccupied soil is coming fast into the European market, and foreign capitalists and speculators are holding competition with our own."

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With the addition of the Mexican Cession, annexation of Texas, and Oregon territory, it would effectively establish more direct borders with the British powers to the north in Canada, and Mexico to the south. Gaining these territories would also enable access to its natural resources and permanently remove any foreign competition from the area.  "Why fight a hazardous war over this wilderness behalf on an unpopular monopoly, the Hudson's Bay Company, which had already "furred out" much of the area anyhow?" (In regards to Oregon territory, American Pageant chp 17)

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California's Northern forests were a good source of timber

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Gold was discovered in a river off of Sutter's Mill, California in 1848. Gold had a value of of $20.67 per ounce, today that is worth $590.95