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The Impact of Westward Expansion

May 8, 2025

Crash Course U.S. History: Texas and California

Manifest Destiny and Westward Expansion

  • Manifest Destiny: Term by journalist John O'Sullivan to justify American expansion from Atlantic to Pacific Oceans.
    • Emphasized economic motivations and Jefferson's "empire of liberty."
  • Economic Expansion: Driven by opportunities in the west, despite existing inhabitants like Native Americans and Mexicans.
  • Slavery: A significant issue tied to expansion, postponed for later discussion.

Oregon Trail and Settlements

  • Oregon Trail: Nearly 300,000 people traveled to the western U.S. by 1860.
  • Oregon: Jointly controlled by the U.S. and Britain.
  • Northern Mexico: Included present-day Texas, Arizona, Utah, Nevada, New Mexico, and California.
    • Only New Mexico and California had significant settlements.

Texas Independence and Annexation

  • Mexican Land Grants: Mexico's government granted land to Moses Austin for economic development.
    • Stephen Austin sold parcels, leading to 7,000 Americans in Texas.
  • Political Tensions: Mexico annulled land contracts and banned further American immigration.
  • Texas Independence: Resulted from demands for autonomy and led to the Alamo and San Jacinto battles.
    • Texas became the Lone Star Republic.
  • Annexation Issues: U.S. delayed annexation due to slavery concerns; annexed in 1845.

The Mexican-American War

  • President James K. Polk: Sought to acquire California from Mexico.
  • Border Disputes: Troops sent to disputed regions, leading to war.
  • Public Opinion: Majority supported the war; critics included Thoreau and Lincoln.
  • Treaty of Guadalupe Hidalgo (1848): Mexico ceded Texas and California, U.S. paid $15 million.

California and the Gold Rush

  • Post-Treaty California: Increase in Spanish-speaking Mexicans and Native Americans under U.S. jurisdiction.
    • Rising nativism and anti-immigrant sentiment.
  • Gold Rush: Population boom in California due to gold discovery in 1848.
    • Chinese immigrants and women played roles in economic activities.

Statehood and the Compromise of 1850

  • California Statehood: Admitted as a free state, sparking southern concerns.
  • Compromise of 1850: Negotiated by Henry Clay to maintain the North-South balance.
    • Included California as a free state, banned slave trade in D.C., and enforced fugitive slave laws.

Social and Political Implications

  • Nativism: Anti-immigrant, anti-Catholic sentiment affected politics.
    • The "Know-Nothings" party emerged.
  • Civil Rights Discrimination: California constitution limited civil rights to whites.
  • Impact of Expansion: Failure to extend liberties to minorities and uphold U.S. ideals fueled tensions.

Conclusion

  • Inevitability of Civil War: Expansion and slavery set the stage for future conflicts.
  • Governance Issues: U.S. struggled to govern by its own ideals, affecting minority groups.