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Overview: The Missouri Compromise of 1820 was America's first major attempt to resolve the issue of slavery as it expanded into new territories.
Key Elements:
  - Admission of Maine: Maine was admitted to the Union as a free state to maintain balance between free and slave states.
  - Admission of Missouri: Missouri entered as a slave state, maintaining the balance of eleven free states and eleven slave states.
  - 36°30′ Line: A geographic line was drawn at the latitude of 36°30′; territories north of this line would be free from slavery, while territories south could allow slavery.
Political Context: Politicians aimed to keep the number of slave and free states equal to avoid conflict and preserve the Union. The compromise provided a temporary solution but did not address the underlying tensions between free and slave states, giving birth to sectionalism.

Overview: Following the Mexican-American War, America acquired new territories, raising the question of whether they would be free or slave states.
Key Players:
  - Henry Clay: The primary architect of the Compromise, known as the Great Compromiser.
  - Stephen Douglas: Advocated for popular sovereignty, the right of residents in territories to decide on slavery.
  - John C. Calhoun: Represented Southern interests and pushed back against the compromise.
  - Daniel Webster: A Northern voice calling for a compromise due to the pressures of sectionalism.
Components of the Compromise:
  1. California Admission: California was admitted as a free state, tipping the balance in favor of the North.
  2. Slave Trade Abolished in Washington, D.C.: The slave trade was abolished, although slavery itself remained legal.
  3. Popular Sovereignty in New Territories: Territories such as Utah and New Mexico would determine their status on slavery through popular sovereignty.
  4. Fugitive Slave Law: Stricter enforcement of laws requiring citizens to assist in the return of runaway slaves, leading to significant Northern opposition.
  5. Texas Boundary Adjustment: Texas relinquished some land in exchange for financial compensation to stabilize its borders.

Definition: Manifest Destiny was the 19th-century belief that it was America's God-given right and duty to expand across the North American continent.
Historical Context:
- James K. Polk: The president known for his strong support of Manifest Destiny, promoting the idea of U.S. expansion from coast to coast.
- Religious Connotations: Many early proponents believed that America was chosen by God to spread democracy and civilization, often justifying expansionist policies.
Key Events:
  - Acquisition of Florida: The U.S. purchased Florida from Spain for $5,000,000$ via the Adams-Onís Treaty in 1819.
  - Texas Independence: Texas declared independence from Mexico, leading to its eventual annexation into the United States.
  - Oregon Territory: Disputes over the Oregon Territory led to the slogan "54-40 or Fight!" before a peaceful resolution set the border at the 49th Parallel.
  - California and the Mexican-American War: The desire to acquire California was a key factor leading to the war with Mexico; the U.S. was willing to negotiate, but after Mexican refusal, conflict ensued.

Context: Texas was originally part of Mexico, which had recently gained independence from Spain. Mexicans sought to populate Northern Mexico and encouraged Americans to migrate under specific conditions (Catholicism, no slavery).
Key Figures:
- Stephen F. Austin: The empresario who brought the first American families into Texas, helping to establish a significant American presence there.
- Santa Anna: The Mexican president and general, whose actions provoked rebellion among Texan settlers.
Events:
- Texas Revolution: Conditions led to distrust and conflict, culminating in battles like the Alamo, where Texans fought for their independence.
- Lone Star Republic: Following their victory at San Jacinto, Texas became an independent republic for nine years before being annexed by the U.S. as a slave state, pushing the balance toward sectional tension.

Overview: Sparked by territorial disputes following Texas' annexation and the desire for California.
Key Events:
- Disputed Territory: Conflicting perceptions of the southern border led to violence when U.S. troops engaged in skirmishes with Mexican forces, famously framed by Polk as "American blood on American soil."
- Treaty of Guadalupe Hidalgo (1848): Ended the war, ceding a significant portion of land to the U.S. (California, Nevada, Utah, Arizona, and parts of Colorado, New Mexico, and Wyoming) in exchange for $15,000,000$ and the assumption of debts. This expanded U.S. territory by 25%.

Overview: The discovery of gold in California in 1849 led to a massive westward migration and demographic change.
Demographic Shift:
- Increased immigration, especially from Asia, with many entering California; notable cultural and economic impacts.
- The influx of miners transformed California into a state in 1850 due to rapid population growth.
Economic Implications:
- Many miners did not achieve wealth; instead, merchants and service providers catered to them, capitalizing on their needs (e.g., selling picks, food, services at inflated prices).
- This economic growth hastened the fulfillment of Manifest Destiny, incorporating California into the national fabric.

Political Climate Pre-Civil War:
- The 1850s were marked by increasing sectional divisions as national political parties began to align more with either the North or the South.
Emergence of Sectional Parties:
- By the 1860 elections, the political landscape had shifted to favor sectional parties, with the Democrats primarily representing Southern interests while Republicans appealed to Northern interests.
Crisis of the 1850s:
- Events like the Kansas-Nebraska Act (1854) and the resulting violence (Bloody Kansas) demonstrated the deepening divide over the question of slavery.
- The Dred Scott Decision further polarizing the nation by stripping free territories of their status, declaring slaves property, and exacerbating tensions between the North and the South.

Civil War Precipitation: The series of compromises, wars, territorial acquisitions, and the political realignment showcased the growing tensions that ultimately led to the Civil War. Factors included economic disparities, moral opposition to slavery, and the struggle for political power between free and slave states.
Legacy: The Compromise of 1850 bought time for the Union but failed to provide a lasting solution, setting the stage for more intense conflicts leading to the Civil War.