Westward Expansion 19th Century

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The 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.
Former U.S. president Thomas Jefferson believed that the nation's future depended on its Westward Expansion. In 1803 the Louisiana Purchase took place, Expanding the size of the territory.The expansion of the United States into the territory west of the Mississippi River began with the Louisiana Purchase in 1803. It took American colonists a century and a half to expand as far west as the Appalachian Mountains, a few hundred miles from the Atlantic Coast.
It took another 50 years to push the frontier to the Mississippi River. In the 1830's and 1840's, "Manifest Destiny."
The idea that the United States was