Manifest Destiny

Causes and Effects of Westward Expansion (1844-1877)
- Westward expansion driven by various factors such as economic opportunities, land availability, and the desire for new beginnings.
- Significant effects included shifts in demographics, cultural exchanges, and increased tensions regarding slavery.
Causes and Effects of the Mexican-American War
- The war was instigated by territorial disputes, including land claims in Texas, California, and New Mexico.
- It resulted in significant territorial gains for the U.S. and exacerbated sectional tensions relating to slavery.

The erratic Mexican President Antonio Lopez de Santa Anna prohibited further American immigration.
He dispatched armies to Texas, leading to the imprisonment of Austin and contemplating the abolition of slavery in the region.
As Texans organized resistance, hundreds of Americans arrived in Texas, with notable figures such as Davey Crockett, James Bowie, and William B. Travis participating.
Two major massacres at San Antonio (The Alamo) and Goliad incited anger among the Texans.
At the Battle of San Jacinto near present-day Houston, Texas forces defeated Santa Anna in just 18 minutes, killing fleeing troops.
This victory secured Texas' independence in 1836, and captured Santa Anna later signed a treaty recognizing Texas independence.
Many in the U.S. feared that annexing Texas would intensify sectional tensions between free and slave states.

A geopolitical overview showing U.S. and British territorial claims around the Oregon Territory, with various forts marked, indicating conflicts over land ownership and settlement rights.

Democrats rallied around James Polk in the 1844 presidential election, promoting expansionist ideologies.
Slogan “Fifty-four forty or fight!” reflected U.S. ambitions in Oregon, alongside the call for Texas annexation.
Both the British and the U.S. claimed sovereignty in Oregon, us firming settler representation tipped favor towards U.S. claims by outnumbering British settlers.
The 1846 arrangement allowed the U.S. to gain the southern half of Oregon, while British Columbia remained a British possession.
Texas was admitted as the 28th state in 1845 (the 15th slave state), leading to disputes regarding borders with Mexico (U.S. claimed the Rio Grande River, while Mexico claimed the Nueces River, 130 miles north of the former).

The Mexican-American War stemmed from various disputed regions, primarily the California and New Mexico territories.
President Polk attempted to buy these territories, but Mexico refused to sell, leading the U.S. to declare war following cross-border tensions at the Nueces River.
The U.S. rapidly captured the territories of California and New Mexico, ultimately sending a larger force to seize Mexico City and establish a new government.
Facing upcoming elections, Polk opted not to annex further portions of Mexico.
The war concluded with the Treaty of Guadalupe Hidalgo, whereby Mexico ceded significant territory to the U.S. and received $15 million as compensation for losing a third of its land.

Following Texas' annexation, five additional free states (Iowa, Wisconsin, California, Minnesota, and Oregon) were added between 1846 and 1859, disturbing the balance of free and slave states (19 free vs. 15 slave), further heightening Southern anxieties.
The Gold Rush of 1849 led to severe migrations of miners (over 250,000 individuals between 1849-1852) to California, causing a significant economic transformation and creating a necessity for stable governance in these new regions.

The Wilmot Proviso, proposed by Representative David Wilmot, sought to prohibit slavery in any territories acquired from Mexico but ultimately passed in the House but failed in the Senate.
To resolve tensions, Polk extended the Missouri Compromise line to the West Coast, suggesting “popular sovereignty” where states would decide their slavery status.
Some proponents viewed statehood as a viable solution to settle the contentious question of slavery in new territories.

Definition:
- Manifest Destiny is the belief held by many Americans in the mid-19th century that it was their God-given right and duty to expand the nation's territory across the continent.
- This belief was coupled with a notion of the superiority of American institutions and culture, expressing a nationalistic pride and an idealistic vision of social perfection.
- It provided a justification for the expansionist agenda of the U.S., often with a racist undertone that denigrated non-white people as unfit for a republican system of governance.
Key Aspects of Manifest Destiny:
- Promoted the idea of extending liberty and the U.S. political system to other peoples.
- Coined by a New York journalist, the term rationalized the desires of white settlers for western lands and influenced policies, politics, and societal views.
Relation to Popular Sovereignty:
- Manifest Destiny intersected with popular sovereignty as both concepts revolved around the idea of expansion and the political implications of governance in new territories, particularly regarding the institution of slavery.
- The ideology reinforced the notion that newly incorporated territories could choose their stance on slavery, reflective of the broader debates about nature and governance in areas gained through the war and beyond.