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The Mexican-American War (1846-1848) was fueled by the U.S. desire to expand its territory, particularly following the 1844 election of James K. Polk, who pledged to annex Texas and Oregon while buying California. As southern settlers moved to Texas, the potential for it to become a slave state intensified tensions. The war began when General Zachary Taylor crossed the disputed Nueces River, leading to conflict with Mexico. The U.S. emerged victorious, leading to the Treaty of Guadalupe Hidalgo, which ceded vast territories, including California and parts of the Southwest, significantly shaping the nation and igniting debates over slavery.
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Texas • Idea of getting TX was popular • Southerners moved there meaning it would be slave state • Election of 1844 • James K. Polk • said he would annex TX & Oregon • wanted to buy California
Annexation • TX joined Union in 1845 • Dispute over Southern boarder • Mexico – Nueces River • U.S. – Rio Grande (150 miles SW)
War • Gen. Zachary Taylor crossed Nueces • Mexico considered it an invasion • Polk wanted Mexico to fire 1st shot • 3 part strategy • Taylor across Rio Grande • take Santa Fe • advance on Mexico City
Bear Flag Republic • Uprising in CA • Leader – Gen. John C. Fremont • CA named Bear Flag Republic • U.S. troops arrived & took control
Mexico City • Strategy worked as planned • Mexico refused to surrender • Polk sent Gen. Winfield Scott to take city
Treaty of Guadalupe Hidalgo • Mexico gave up 500,000 sq. miles to U.S. • CA, UT, NV, part of NM, AZ, CO, WY • Rio Grande set as TX boarder • U.S. paid Mexico $15 million & $3.25 million in Mexican debts
Manifest Destiny • U.S. now went from sea to sea • Completed with Oregon/Mexican territories • Trade now easier with Asia • Whether or not to allow slavery in the new territories would now be the big question.