Westward Expansion and the Compromise of 1850 John C. Calhoun… Daniel Webster… Henry Clay… Key events that led to the Compromise of 1850: § The Treaty Of Guadalupe-Hidalgo: ended the Mexican War; gave the U.S. the Mexican Cession. § The Wilmot Proviso and Calhoun’s resolutions: ideas on how to handle the slavery question in new territory. § Lewis Cass and Popular Sovereignty: adds a new wrinkle to the salvery debate. § Presidential Election of 1848: Taylor defeats Cass. § The California Gold Rush, 1848-1849: increases the importance of new lands added after the Mexican War. Summary questions: § Discuss the impact of territorial expansion on national unity between 1800-1850. § The Compromise of 1850 and its aftermath marked the culmination of an old style of politics; its reception and results indicated that a new style of politics would become dominant.” Assess the validity of this generalization.