Heimler APUSH TP 5.2

Major concept in American history, driving motivations for territorial growth.
Initially focused on expansion beyond the Atlantic Coast, then into the Ohio River Valley and the vast Louisiana Purchase.
Expansion is a core aspect of American identity during this era.

Coined by newspaper editor John O’Sullivan in July 1845.
Definition: The belief that Americans were destined by Providence (God) to expand across the continent.
O’Sullivan argued for possessing the continent from sea to shining sea.
Implicit in this ideology is the American entitlement to land, extending to islands in the Pacific and Caribbean in future contexts.

Access to Resources: The discovery of gold in California (1848) triggered a massive influx of people seeking riches, known as the California Gold Rush.
Land Availability: The Preemption Acts made land easily accessible and affordable for settlers, appealing largely to the middle class seeking homesteads.

The Mormons emigrated to the Utah Territory to escape persecution encountered in the Midwest, resulting in about 70,000 Mormons migrating over 20 years.

Polk was an ardent proponent of Manifest Destiny, seeking to annex Texas and Oregon territories.

American settlers had moved into Texas territory (then Mexican-owned) since the 1820s.
By 1830, there were significantly more Americans than Mexicans, the majority of whom were southerners, Protestants, and supporters of slavery.
Mexican laws requiring conversion to Roman Catholicism and prohibiting slavery were largely ignored by American settlers, leading to tensions.
Texans revolted against Mexican authority in 1836, leading to Texas' declaration of independence after a critical battle at the Alamo and the decisive Battle of San Jacinto.
Although Texas declared independence, Mexico never recognized it, complicating Texas' application for U.S. statehood.
Previous presidents declined immediate annexation due to fears of war with Mexico.

Both Britain and the U.S. claimed the Oregon Territory, with U.S. settlers increasing rapidly, motivated by agricultural and missionary interests.
Polk's election was seen as a mandate to annex both Texas and Oregon, leading to the ratification of treaties and the eventual division of the Oregon Territory at the 49th parallel.

Westward expansion was a crucial period defined by motivations rooted in economic opportunity, religious freedom, and territorial ambition shaped by the ideology of Manifest Destiny.
Expansion efforts were influential in changing the political landscape, setting the stage for future conflicts, particularly with Mexico.