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“Manifest Destiny”
Belief in the 1840s that the United States was destined by God and history to expand across North America and possibly beyond
Justified U.S. territorial expansion after the large land gains of the 1840s (most since the Louisiana Purchase)
Reflected strong American nationalism
Claimed expansion would extend American liberty and republican government to new territories
Included a racial justification:
Advocates believed the “American race” were superior & claimed nonwhite people could not participate in a republican system
Spread widely through the penny press (cheap newspapers)
Supporters disagreed over how far expansion should go
Opposed by leaders like Henry Clay, who feared expansion would reopen the slavery controversy & threaten the stability of the Union
Henry Clay
Leading Whig politician and prominent figure in the Election of 1844
Nominated as the Whig presidential candidate, opposed rapid territorial expansion
Avoided taking a firm position on Texas annexation, fearing it would reignite sectional tensions over slavery
Believed expansion could threaten the stability of the Union by increasing conflicts between North and South
Opposed Manifest Destiny arguments for continental expansion, prioritizing national unity over territorial growth
Supported traditional Whig policies:
Internal improvements (infrastructure like roads and canals)
Economic development through tariffs and a national bank
His cautious approach to Texas and slavery issues weakened his appeal, especially in the South, helping James K. Polk win the presidency
Texas
Originally claimed by the U.S. as part of the Louisiana Purchase, but claim was dropped
Became part of the Republic of Mexico after Mexico gained independence
U.S. offered to buy Texas twice; Mexico refused
Mexico encouraged American immigration to Texas to:
Strengthen the economy
Increase tax revenue
Create a buffer against Native Americans and U.S. expansion.
Mexican colonization law offered:
Cheap land
4-year tax exemption
Many American settlers (mostly Southerners with enslaved people) moved in and outnumbered Mexican settlers 2 to 1
Slavery was illegal in Mexico, but Americans wanted it legalized in Texas
Conflict grew after Santa Anna centralized power in Mexico
Americans revolted
Texas won independence after Sam Houston defeated Santa Anna
Santa Anna signed treaty granting independence (later rejected by Mexico)
Texas sought U.S. annexation
Annexation was controversial because:
Northerners opposed expansion of slave territory
Fear of war with Mexico
Eventually annexed under John Tyler
Stephen F. Austin
The most successful American empresario (land agent/intermediary) in Texas
Received large land grants from the Mexican government
Promised to bring American settlers in exchange for land
Helped recruit mostly Southern settlers, many with enslaved people
Established settlements that became centers of American political and economic power
Initially supported a peaceful settlement with Mexico
Was imprisoned by the Mexican government (under orders of Santa Anna) for allegedly encouraging revolt
His imprisonment increased tensions between Americans and Mexico
Became a key figure in the movement toward Texas independence
Antonio Lopez de Santa Anna
A Mexican general and political leader who rose to power during a period of instability in Mexico
Became a dictator and imposed an autocratic (centralized) government
Increased the power of the national government at the expense of state governments
Texas settlers believed his policies were targeted at limiting their autonomy
Imprisoned Stephen F. Austin, accusing him of encouraging rebellion
Led Mexican forces against Texas during the Texas Revolution
Personally led the Mexican army into Texas
Commanded forces at the Alamo & Goliad
Defeated by Sam Houston at the Battle of San Jacinto
Captured by American forces and forced to sign a treaty granting Texas independence
The Mexican government later repudiated (rejected) the treaty
Could not ultimately regain control of Texas
Alamo
A former mission in San Antonio, Texas
Site of a famous battle during the Texas Revolution
Mexican forces under Santa Anna attacked and defeated a small American garrison
The American defense was brave but ultimately ineffective; all defenders were killed
Became a powerful symbol of resistance and sacrifice because Davy Crockett fought & died in this battle
Helped rally Texans to continue fighting Mexico
Goliad
Location of another Texas garrison during the Texas Revolution
Mexican forces captured the American troops
After surrendering, most of the American soldiers were executed by Mexican forces
Sam Houston
Leader of the Texas revolutionary army
Managed to keep a small, organized force together while many Texans fled east
Led Texas forces at the Battle of San Jacinto
Defeated Santa Anna’s army in a surprise attack
Captured Santa Anna
Became the first President of the independent Republic of Texas
Sent a delegation to Washington seeking annexation to the United States
Strong supporter of joining the Union
Battle of San Jacinto
Final and decisive battle of the Texas Revolution
Took place near present-day Houston, Texas & was led by Sam Houston
Texas forces defeated Santa Anna’s army
American troops killed many Mexican soldiers in revenge for Goliad
Santa Anna was captured & forced to sign a treaty granting Texas independence
Secured Texas as an independent republic
Oregon
Northwestern territory including present-day Oregon, Washington, Idaho, parts of Montana and Wyoming, and half of British Columbia
Claimed by both the U.S. and Britain
Dispute led to joint occupation (both nations’ citizens could settle and trade there)
U.S. interest grew due to: evangelical missions, countering Catholic influence from Canada & economic and territorial expansion
Many Americans settled, outnumbering British settlers
Migrants traveled via Oregon Trail, facing hardships, disease, and difficult environmental conditions
Settlement contributed to displacement of Native Americans, including the Cayuse
“Joint occupation”
Agreement between Britain and the U.S. over Oregon Country
Allowed citizens of both nations equal access to trade and settlement; lasted for 20 years
Neither nation had a large presence, leaving settlement to fur traders, missionaries, and settlers
Facilitated eventual American demographic dominance in Oregon
California Gold Rush
Began in 1848 after James Marshall discovered gold at John Sutter’s sawmill in the Sierra Nevada foothills
Marshall initially tried to suppress the discovery, fearing a gold rush would disrupt Sutter’s empire
Word spread rapidly; thousands of migrants, called “Forty-niners”, rushed to California
Migrants included young men seeking fortune, families seeking economic opportunity & Chinese immigrants (mostly free laborers or merchants)
Created a volatile, male-dominated society with high greed and competition
Labor shortages led to exploitation of Native Americans, often as indentured or forced labor (“loitering” laws)
Gold rush accelerated westward migration, economic development & urban/agricultural expansion in California
Intensified national debates over slavery in new territories
Democratic Party
Major political party in the 1840s, generally pro-expansion
Supported Manifest Destiny and the idea that the U.S. was destined to expand across the continent
Nominated James K. Polk in 1844 after former candidate Martin Van Buren declined due to opposition to Texas annexation
Southern Democrats strongly favored annexing Texas to expand slave territory and increase Southern political power
Democratic platform included the occupation of Oregon, annexation of Texas, & the support for westward expansion as a national duty
Polk’s victory was seen as a mandate for expansionist policies
Party division reflected sectional interests:
Southern Democrats prioritized slavery expansion
Western Democrats supported settlement and development of new territories
James K. Polk
Democratic presidential candidate in the Election of 1844; won the presidency
Represented Tennessee in the House of Representatives before running
Strong supporter of Manifest Destiny and territorial expansion
Platform included annexation of Texas, occupation of Oregon & expansion into California and New Mexico
Campaigned as the expansionist alternative to Whig candidate Henry Clay, who avoided the annexation issue
Claimed that his victory gave him a mandate to pursue expansionist policies, which gave political legitimacy to Texas annexation
Negotiated the Oregon border dispute with Britain, ultimately settling at the 49th parallel
Supported expansion while trying to balance sectional tensions over slavery, though his actions often favored Southern interests, leading to Northern opposition
49th parallel
The U.S.-British boundary in the Oregon Territory was eventually set at the 49th parallel
Resolved disputes over Oregon Country peacefully
Negotiated under President James K. Polk after British rejection of his earlier compromise
Maintained U.S. control south of the line while Britain retained Vancouver Island and areas north
Avoided potential war with Britain while fulfilling part of the Manifest Destiny agenda
“54-40 or fight!”
Slogan used by expansionists during the Oregon boundary dispute
Referred to the northern latitude line (54°40′) that some Americans claimed as the U.S. boundary with Britain
Represented a willingness to go to war with Britain if the full Oregon Territory was not ceded
Polk eventually compromised at the 49th parallel, avoiding war but satisfying most Americans’ desire for westward expansion
Rio Grande River
Claimed by Texas and the U.S. as the southern and western border of Texas
Disputed by Mexico, which argued the border was the Nueces River to the north
Polk accepted the Texan claim and sent General Zachary Taylor to protect the border
Crossing of this river by U.S. troops led to Mexican attacks, which Polk used as a justification to declare war on Mexico
Nueces River
River north of the Rio Grande, claimed by Mexico as the border with Texas
Disputed with U.S. and Texas, who claimed the Rio Grande as the proper boundary
Dispute contributed directly to the Mexican-American War (1846–1848)
Zachary Taylor
General in the U.S. Army and hero of the Mexican-American War
Led troops during the Texas-Mexico border disputes, including the movement across the Nueces River to the Rio Grande
Captured Monterrey, but allowed Mexican forces to evacuate, causing President Polk to doubt his tactical skill for advancing to Mexico City
Polk feared Taylor could become a political rival due to his popularity from the war
Nominated by the Whig Party in the Election of 1848, despite having no political experience, because of his national fame as a military hero
Won the election and became President of the United States, during which the issue of slavery in new territories became pressing
Believed that statehood could solve the slavery issue, encouraging California to draft a constitution prohibiting slavery and asking Congress to admit it as a free state
Advocated for New Mexico also to achieve statehood and decide on slavery for themselves
Monterrey
City in northeastern Mexico captured by General Zachary Taylor during the Mexican-American War
Taylor allowed Mexican troops to evacuate after the battle
Polk thought Taylor lacked tactical skill to advance on Mexico City and feared he would become a political rival
Mexico City
Capital of Mexico and ultimate objective of Polk’s war strategy
General Winfield Scott led a successful campaign to capture it after coordinating a large army along the Mexican coast
Seizure of the city forced Mexico to negotiate peace, eventually leading to the Treaty of Guadalupe Hidalgo
Stephen W. Kearny
U.S. general during the Mexican-American War
Successfully captured Santa Fe, New Mexico, facing no opposition
Moved on to California, coordinating with local settlers and military forces
Helped bring different American forces in California together under his command
Played a key role in securing U.S. control of the Southwest, supporting Polk’s expansionist goals
John C. Fremont
Led an American exploring party during the Mexican-American War
Participated in the Bear Flag Revolution, helping American settlers take control of California
Worked alongside Stephen W. Kearny and the U.S. Navy, integrating multiple efforts to secure California
Contributed to the American victory in California and eventual incorporation of the territory into the U.S.
Republican presidential candidate in 1856
Known as a national explorer of the Far West with no political experience
Represented Republican opposition to the expansion of slavery into new territories
His campaign demonstrated the Republican Party’s rising influence in the North
Denounced the Kansas-Nebraska Act and expansion of slavery, connecting moral opposition to slavery with economic aspirations of the North
Bear Flag Revolution
Uprising by American settlers in California against Mexican authority
Led by John C. Fremont and others during the Mexican-American War
Resulted in temporary independence for settlers before the territory was formally brought under U.S. control
Winfield Scott
Commanding general of the U.S. Army during the Mexican-American War
Known as Polk’s best soldier and strategist
Led a campaign down the Mexican coast to capture Mexico City
Kept American casualties low and never lost a battle, showing superior military skill
Capture of Mexico City under Scott’s leadership forced Mexico to negotiate peace, ending the war
ran for President under the Whigs in 1852
Treaty of Guadalupe Hidalgo
Officially ended the Mexican-American War
Mexico:
ceded California and New Mexico to the United States
Recognized the Rio Grande as the border of Texas
US:
assumed money claims of its citizens against Mexico and paid $15 million to the Mexican government
Negotiated by Nicholas Trist despite Polk’s unclear instructions
Resulted in massive territorial gain for the U.S., fueling debates over slavery and sectional tensions in Congress
David Wilmot
Representative from Pennsylvania and antislavery Democrat
Introduced the Wilmot Proviso, which aimed to prohibit slavery in any territory acquired from Mexico
Proviso passed the House of Representatives but failed in the Senate
Became central in sectional debates over slavery, as Southerners argued they had the right to bring enslaved people into new territories
Highlighted conflict between Northern and Southern interests over territorial expansion and slavery
Wilmot Proviso
Proposed by David Wilmot, a representative from Pennsylvania and antislavery Democrat
Introduced as an amendment to an appropriation bill requesting $2 million to negotiate peace with Mexico (during the Mexican-American war)
The amendment prohibited slavery in any territory acquired from Mexico during the Mexican-American War
Passed the House of Representatives but failed in the Senate, reflecting the sectional divide between North and South
Became a central issue in congressional debate over the expansion of slavery
Southerners strongly opposed it, claiming they had the right to bring their “property” (enslaved people) into new territories
Debate over the Proviso continued for years, influencing later conflicts over the status of slavery in western lands
Highlighted the growing tension between Northern free-soil interests and Southern slaveholding power in the U.S. government
“Popular sovereignty”
Idea that residents of a territory could decide the status of slavery themselves through their legislature
Proposed as a solution for new territories from Mexico
Supported by politicians who wanted to avoid direct federal involvement in slavery decisions
Led to conflicts like Bleeding Kansas, as different groups tried to influence territorial decisions
Free-Soil Party
Political party formed by antislavery factions of Whigs, Democrats, and the Liberty Party
Endorsed the Wilmot Proviso to prohibit slavery in new territories
Nominated Martin Van Buren in 1848
Represented growing political frustration with existing parties over the slavery issue
Showed the increasing sectional divide and influence of slavery on politics
“Forty-niners”
Migrants who rushed to California during the Gold Rush after Marshall’s discovery
Mostly men who abandoned farms, jobs, and families to seek wealth
Created a volatile society with few women or families
Their migration contributed to population growth, urban expansion, and labor shortages
Increased racial and social tensions, especially affecting Native populations and nonwhite immigrants
Personal liberty laws
Passed by Northern states to counter the Fugitive Slave Law/Act
Stopped courts and law enforcement from returning fugitive enslaved people to Southern slaveholders
Reflected Northern resistance to federal pro-slavery enforcement
Contributed to sectional tension, as Southerners viewed these laws as undermining their property rights
Fugitive Slave Law/Act
Part of the Compromise of 1850 to appease Southern interests
Required Northern states to return fugitive enslaved people to their owners
Northern mobs and states actively resisted enforcement, sometimes passing personal liberty laws
Highlighted the conflict between federal authority and state/local resistance over slavery
Increased sectional tensions and made the issue of slavery more prominent in national politics
Compromise of 1850
Created to resolve sectional crises following the Mexican-American War and territorial expansion
Proposed by Henry Clay, aiming to settle all disputes between North and South
Key provisions:
California admitted as a free state.
Territorial governments established in lands gained from Mexico without restrictions on slavery, leaving the decision to settlers. (POPULAR SOVEREIGNTY)
Abolition of the slave trade in the District of Columbia, but slavery itself remained legal
New, stricter Fugitive Slave Law to enforce Southern slaveholders’ - rights
Passed in two phases due to political strategy and sectional divisions
Franklin Pierce
Democrat and President elected in 1852
Tried to maintain harmony by avoiding divisive issues like slavery, though largely unsuccessful
Supported the Young America movement, which aimed to expand American democracy and commerce abroad to divert attention from domestic slavery debates
Attempted to purchase Cuba from Spain; Ostend Manifesto controversy angered anti-slavery Northerners, who feared new slave states
Oversaw sectional tensions in U.S. territories and expansion efforts
“Young America”
Movement within the Democratic Party during Pierce’s presidency
Advocated for expanding American democracy internationally as a distraction from slavery issues
Supported economic expansion, Pacific trade, and acquiring new territories (e.g., Cuba)
Linked domestic expansionism with sectional disputes, sometimes creating controversy
Goal was to extend U.S. influence while avoiding immediate internal conflict
Ostend Manifesto
Private document from Ostend, Belgium, during Pierce’s presidency
Advocated seizing Cuba from Spain by force if Spain refused to sell
Intended to expand slave territory and benefit Southern interests
Caused Northern outrage, as anti-slavery leaders saw it as a conspiracy to add a new slave state
Damaged Pierce’s administration politically
Transcontinental railroad
Proposed to connect eastern U.S. to western territories
Northern politicians wanted it to run through the North , Southern politicians wanted a southern route through slave states
Southern route required land from Mexico, leading to the Gadsden Purchase
Became a source of sectional tension because its location affected economic and political power between North and South
James Gadsden/Gadsden Purchase
James Gadsden sent by Jefferson Davis to negotiate land from Mexico
U.S. paid $10 million for land in what is now southern Arizona and southwestern New Mexico
Intended to provide a southern route for the transcontinental railroad
Kansas-Nebraska Act
Introduced by Stephen A. Douglas to organize Nebraska territory, north of the Missouri Compromise line (also did it to build a transcontinental railroad in the North)
Allowed popular sovereignty: settlers could decide on slavery
Repealed the Missouri Compromise, allowing slavery in previously free areas
Divided the area into Kansas (likely slave) and Nebraska (likely free)
Sparked Bleeding Kansas, as Northern and Southern settlers moved to influence elections
Led to political realignments, including the formation of the Republican Party
Republican Party
Emerged in the mid-1850s from Anti-Nebraska Democrats, Northern Whigs, and Free-Soilers who opposed the Kansas-Nebraska Act and the repeal of the Missouri Compromise
Formed as a sectional party representing the Northern states and their economic, territorial, and social interests
Strongly opposed the expansion of slavery into new western territories, promoting the ideology of “free soil” and “free labor”, which emphasized opportunities for Northern white workers and the right to control one’s own labor
Viewed the South as attempting to expand an aristocratic, slaveholding system across the nation, which Northerners called the "slave power conspiracy"
Became a major political force, winning enough seats in Congress to help organize the House of Representatives
Ideologically, the party combined opposition to slavery with economic development, supporting internal improvements, railroads, and free labor ideals
John Brown
Radical abolitionist who moved to Kansas to fight for a Free-State government
Led a group to murder five pro-slavery settlers in the Potawatomie Massacre
Believed he was an instrument of God to destroy slavery
Actions contributed to guerrilla warfare in Kansas and heightened sectional conflict
also raided the U.S. arsenal in Harpers Ferry
Potawatomie Massacre
Violent attack led by John Brown in Kansas
Killed five pro-slavery settlers and left bodies on display to intimidate others
Escalated the civil strife in Kansas, contributing to the period known as Bleeding Kansas
Symbolized the moral and violent conflict over slavery in western territories
“Bleeding Kansas”
Period of violence in Kansas (mid-1850s) over slavery after the Kansas-Nebraska Act
Resulted from pro-slavery and Free-State settlers competing for control of the territorial legislature
Featured events like Lawrence attack and Potawatomie Massacre
Highlighted the failure of popular sovereignty and the nation’s sectional divisions
Charles Sumner
Senator from Massachusetts, opponent of slavery
Delivered speech “The Crime Against Kansas” criticizing pro-slavery forces
Personally attacked Senator Andrew P. Butler of South Carolina with harsh language and sexual references
Speech inflamed sectional tensions and led to violent retaliation in the House of Representatives
“The Crime Against Kansas”
Speech by Charles Sumner condemning slavery and pro-slavery politicians
Focused on the violence in Kansas and Southern aggression
Criticized Senator Andrew P. Butler, making personal attacks
Sparked a violent response from Preston Brooks, who caned Sumner unconscious, showing the deep sectional anger in the country
Preston Brooks
Nephew of Andrew P. Butler and member of the House of Representatives
Reacted violently to Sumner’s speech by attacking him with a cane in the Senate chamber until Sumner was unconscious
Viewed as a hero in the South for defending Butler’s honor
Angered the North, highlighting increasing sectional tension before the Civil War
Nat Turner
Leader of a slave rebellion in Virginia (past event referenced in Southern fears)
His rebellion caused fear among Southern whites, reinforcing the defense of slavery as necessary for social order
Motivated Southern efforts to strengthen slavery and justify new pro-slavery ideology
Harriet Beecher Stowe
Author of Uncle Tom’s Cabin, a novel criticizing slavery
Provided evidence of Northern attacks on Southern society
Contributed to Southern fears of abolitionist influence and reinforced the pro-slavery defensive ideology
Part of Northern moral and cultural pressure against slavery
James Buchanan
Democrat from Pennsylvania, elected President in 1856
Avoided involvement in Bleeding Kansas, as he was out of the country during the crisis, trying to remain neutral
Endorsed Dred Scott v. Sandford decision as President
Tried to resolve the controversy over Kansas by supporting admission under the pro-slavery Lecompton Constitution, even though most settlers opposed it
Described as shy, indecisive, and cautious, governing during a period of intense sectional tension
His presidency saw the Economic Panic of 1857, which strengthened the Northern Republican Party
Dred Scott v. Sandford
Most controversial Supreme Court decision in U.S. history, handed down two days after Buchanan’s inauguration
Case involved Dred Scott, an enslaved man from Missouri who had been taken by his owner into free territories (Illinois and Wisconsin) where slavery was illegal
Scott sued the owner’s widow for freedom, claiming that residence in free territory freed him from slavery
The circuit court initially declared Scott free, but John Sandford (brother of the widow) appealed, claiming ownership
Missouri State Supreme Court reversed the lower court decision, ruling Scott remained enslaved
When appealed to the federal Supreme Court, several rulings emerged:
Scott could not sue because he was not a U.S. citizen, and African Americans had no rights under the Constitution
Enslaved people were legally considered property, protected under the 5th Amendment, meaning Congress could not deprive owners of their property without “due process of law”
Declared the Missouri Compromise unconstitutional, as Congress had no authority to ban slavery in territories
Impact of the decision:
White Southerners were pleased, seeing it as a validation of slavery
Northerners were outraged, viewing it as a threat to free labor and territorial freedom
Republicans threatened court “packing” to reverse the decision when they gained control of the federal government
Roger Taney
Chief Justice of the U.S. Supreme Court who issued the Dred Scott decision
Ruled that:
Dred Scott could not sue, as African Americans were not citizens
Enslaved people were property protected by the 5th Amendment, so Congress could not restrict slavery in territories
The Missouri Compromise was unconstitutional
Decision was celebrated in the South and outraged Northerners, contributing to the rise of Republican opposition
Lecompton Constitution
Drafted by the pro-slavery territorial legislature in Kansas
Legalized slavery in Kansas and refused to give voters a chance to reject it
President Buchanan supported its admission, despite majority of settlers opposing slavery
Congress compromised, allowing Kansas voters to approve or reject it; Kansas rejected it, showing Northern resistance to expansion of slavery
Lincoln-Douglas Debates
Series of debates during 1858 Illinois Senate election
Abraham Lincoln argued that slavery threatened opportunities for free laborers; morally wrong but not advocating abolition where it already existed
Stephen A. Douglas supported popular sovereignty and opposed Black citizenship, claiming territories should decide slavery themselves
Debates drew large crowds and national attention, boosting Lincoln’s profile
U.S. arsenal in Harpers Ferry
Target of John Brown’s 1859 raid in Virginia
Brown planned to arm enslaved people and spark a slave rebellion
Seized the arsenal with 18 followers, but the uprising failed
Demonstrated Southern fears about Northern abolitionists and increased tensions before the Civil War
Election of 1860
Most momentous presidential election in U.S. history
Democratic Party split:
Southern Democrats nominated John C. Breckinridge, supporting slavery
Northern Democrats favored popular sovereignty, leading to party division; nominated Stephen A. Douglas
Constitutional Union Party nominated John Bell, endorsing the Union and remaining silent on slavery
Republicans nominated Abraham Lincoln, platform included:
High tariffs, internal improvements, Homestead Bill, Pacific railroad
Opposed slavery expansion into territories
Lincoln won the presidency with majority of electoral votes, though not the popular vote
Election outcome triggered Southern secession discussions, paving the way for the Civil War
Constitutional Union Party
Formed by conservative ex-Whigs in 1860
Nominated John Bell of Tennessee for president
Platform emphasized preserving the Union and avoided taking a stance on slavery
Represented a moderate faction trying to prevent sectional crisis from escalating
Republican platform
Platform for the 1860 election, promoting Northern economic and political interests
Endorsed traditional Whig measures:
High tariffs to protect industry
Internal improvements such as roads and canals
Homestead Bill to provide free land for settlers
Pacific railroad to be built with federal assistance
Opposed the expansion of slavery into territories, insisting neither Congress nor territorial legislatures could legalize slavery
Aimed to broaden appeal in the North and unite anti-slavery and economic modernization supporters