US President who was a pro-expansionist Democrat, eager to acquire Mexican territory.

Led the Texan army to victory at San Jacinto, securing Texas's independence.

A legendary figure who died defending the Alamo.

The U.S. diplomat who negotiated the Treaty of Guadalupe Hidalgo.

The Mexican general and president during the Texas Revolution and the Mexican-American War.

A U.S. general during the Mexican-American War who later became President of the United States.

A U.S. general who led the invasion of Mexico City during the Mexican-American War.

A U.S. Congressman who proposed the Wilmot Proviso, which aimed to ban slavery in territories acquired from Mexico.

A U.S. general who led forces to capture Santa Fe and California during the Mexican-American War.

A U.S. diplomat sent to Mexico to negotiate the purchase of California and New Mexico before the Mexican-American War.

The 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.

The formal act of acquiring something (especially territory) by conquest or occupation.

The region ceded to the U.S. by Mexico in 1848 under the Treaty of Guadalupe Hidalgo after the Mexican-American War.

A proposal to ban slavery in any territory acquired from Mexico; it failed to pass the Senate.

The principle that the authority of a state and its government is created and sustained by the consent of its people, through their elected representatives (Rule by the People), who are the source of all political power.

Loyalty to the interests of one's own region or section of the country, rather than to the country as a whole.

A policy or practice of expansion and especially of territorial expansion by a nation.

A disagreement over the location of a boundary line between two or more entities.

A formally concluded and ratified agreement between countries.

Territory that is formally handed over to another country or entity by treaty or agreement.

Causes: Texan desire to join the US, US expansionism. Effects: Increased tensions with Mexico, led to the Mexican-American War.

Causes: Border dispute, annexation of Texas, US expansionism. Effects: Mexican Cession, intensified slavery debate, worsened US-Mexico relations.

Causes: End the Mexican-American War. Effects: US gained vast territories, US paid Mexico $15 million, guaranteed rights to Mexicans (often violated).

Causes: Fear of slavery expansion into new territories. Effects: Increased sectional tensions, failed to pass the Senate, foreshadowed future conflicts.

Causes: Belief in American superiority, desire for land and resources. Effects: Expansion into new territories, conflict with Native Americans and Mexico, intensified slavery debate.

Causes: Discovery of gold in California. Effects: Rapid population growth, economic boom, increased demand for statehood, intensified debate over slavery.

Causes: Desire to resolve the slavery issue in newly acquired territories. Effects: Temporary easing of tensions, but ultimately failed to address the underlying issues, leading to further conflict.

Causes: Desire to organize new territories, popular sovereignty. Effects: Violence in Kansas (Bleeding Kansas), further division over slavery, weakened the Democratic Party.

Causes: Cultural and political differences between Texan settlers and the Mexican government. Effects: Independence of Texas, increased tensions between the US and Mexico, eventual annexation of Texas.

Causes: Desire for a southern railroad route to California. Effects: Acquisition of additional territory from Mexico, further strained US-Mexico relations.