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Westward Expansion & Manifest Destiny

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Western Expansion Map

Western Expansion Map.



"If a young man is about to commence in the world ... we say to him publicly and privately, go to the West. There, your capacities are sure to be appreciated and your industry and energy rewarded." 


--  Horace Greeley, editor of the New York Tribune, so urged young men  to go West in the 1850's





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The Frontier In History by Emerson Hough

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A Sketch of the Early "Far West"

Struggle For Possession - The First Emigrants







"Westward, ever westward."

-- Henry Wells





Frontier Fact


Educational video on Westward Expansion and Manifest Destiny. Produced and narrated by Kathy Weiser-Alexander. To Comment on our videos, sign the guest book in our video gallery HERE. Also see us on YouTube HERE.




The expansion of the United States into the territory west of the Mississippi River began with the Louisiana Purchase in 1803. President Thomas Jefferson nearly doubled the size of the nation by negotiating a price of $15 million to purchase 828,800 square miles from France, including all or part of 14 current states. In 1804, Jefferson sent an expedition led by Meriwether Lewis and William Clark to explore the area. The three-year expedition produced new understanding of the geography and resources of the western part of the continent.


Prior to that time, European immigrants did not stretch far beyond the eastern seaboard. The first British settlers in the New World stayed near the Atlantic Ocean to be close to their lifeline for needed supplies from England. By the 1630's, however, Massachusetts Bay colonists were pushing into the Connecticut River Valley.


Resistance from the French and the Indians also slowed westward movement; but, by the 1750's, colonists were living in most of New England. 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 fifty years to push the frontier to the Mississippi River.


Lewis and Clark on the Lower Columbia RiverDespite some continuous push westward, it was not until the conclusion of the War of 1812 that the westward movement became a significant outpouring of people across the continent. By 1830, the Old Northwest and Old Southwest, which were scarcely populated before the war, began to be settled and before long, the states of Illinois, Indiana, Missouri, Alabama, and Mississippi were admitted into the Union.


In the 1830's and 1840's, “Manifest Destiny,” the idea that the United States was destined to expand across the entire continent, was used to promote further territorial expansion. The concept of American expansion was much older, but John L. O'Sullivan coined the term "Manifest Destiny" in the July/August 1845 issue of the United States Magazine and Democratic Review in an article titled Annexation. It was primarily used by Democrats to support the expansion plans of the Polk Administration, but the idea of expansion faced opposition from Whigs like Henry Clay, Daniel Webster, and Abraham Lincoln, who wanted to deepen the economy rather than broaden its expanse.


Sailing to California for the California Gold Rush, 1850sAmericans began to buy into the inevitability of settling unexplored western frontiers, first moving into places such as Michigan, Arkansas, Wisconsin, and Ohio. In the 1840's and 1850's the nation expanded quickly and in the span of just five years, the United States increased its size by a third. It annexed Texas; negotiated with Britain for half of the Oregon country; and acquired more as a result of a war with Mexico as noted in this timeline:

  • In 1845, the United States annexed Texas.

  • In 1846 the Oregon Treaty ended British claims to Oregon Territory.

  • In 1848, following the Mexican-American War, Mexico ceded much of the West and Southwest to the United States. This included what would become the states of California, Nevada, Utah, parts of Arizona, Colorado, New Mexico, and Wyoming.

  • In 1853 the United States bought an additional tract of land from Mexico.

People then began to move in numbers into Texas, California, and Oregon. The California Gold Rush, the construction of railroads, the Mormons' long pilgrimage to Utah, and the blazing of the Santa Fe and Oregon Trails all contributed to the expansion of the "wild west."


American Progress

Westward the course of destiny. George A. Crofutt, 1873.

This image available for photographic prints  and downloads HERE!


Between the California Gold Rush and the Civil War, Americans, in growing numbers filled the Mississippi River Valley, the southwest territories, and the new states of Kansas and Nebraska. During the war, gold and silver discoveries drew prospectors—and later settlers—into Oregon, Colorado, Nevada, Idaho, and Montana. But, the most rapid migration occurred after the One factor in encouraging settlers to move west was the Homestead Act, passed in 1862, which allowed settlers to claim 160 acres of land for free. Another important factor was completion of the first transcontinental railroad in 1869 which led to much more rapid Western migration.  


Westward expansion had serious consequences for Native Americans since continental expansion implicitly meant the occupation and annexation of their lands. The United States continued the European practice of recognizing only limited land rights of indigenous peoples and sought to expand into the west through the nominally legal purchase of Native American land in treaties. In many cases, these treaties were negotiated and signed by tribal members who didn't have the authority to do so, and in some cases, by signers who lacked knowledge of what they were signing. Despite the legality of a treaty, once one was signed, the government often used force to move the Indians from their homelands.


Indians were encouraged to sell their vast tribal lands and become "civilized," which meant they should abandon hunting, become farmers, discontinue nomadic lifestyles, become educated in the “white ways,” and abandon their “savage” ceremonies and practices. Advocates of civilization programs believed that the process of settling native tribes would greatly reduce the amount of land needed by the Native Americans and make more land available for homesteading by white Americans.


By 1870, only portions of the Great Plains could truly be called unsettled. For most of the next two decades, the plains became the fabled open range, home to cowboys and their grazing cattle. But, by the late 1880's, with the decline of the range cattle industry, settlers moved in and fenced the Great Plains into family farms. That settlement—and the wild rush of pioneers into the Oklahoma Indian Territory—constituted the last chapter of the westward movement. By the early 1890's, a frontier had ceased to exist within the 48 continental states.




© Kathy Weiser/Legends of America, updated March, 2017.



"It is America's right to stretch from sea to shining sea. Not only do we have a responsibility to our citizens to gain valuable natural resources we also have a responsibility to civilize this beautiful land."



- Sometimes attributed to Thomas Jefferson, other sources say Admiral Alfred Thayer Mahan


Westward the Course of Empire Takes Its Way, Emanuel Leutze, 1861

Westward the Course of Empire Takes Its Way, Emanuel Leutze, 1861.


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