What conflict in the 19th century marked the U.S. expansion to the Pacific coast? 🔊
The conflict that marked the U.S. expansion to the Pacific coast was the Mexican-American War (1846-1848). Disputes over territory, particularly following the annexation of Texas, escalated tensions between the U.S. and Mexico. The war began when U.S. forces crossed the Rio Grande, leading to significant military engagements. The resulting Treaty of Guadalupe Hidalgo (1848) ceded vast territories, including present-day California, Arizona, New Mexico, and parts of Colorado, Utah, and Nevada to the U.S. This territorial expansion fulfilled the idea of Manifest Destiny, reshaping the nation and intensifying debates over slavery in new territories.
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