The Mexican-American War and Southwestern Cession

Westward Expansion and Territorial Growth of the United States

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Describe how the Mexican-American War (1846–1848) resulted in the Treaty of Guadalupe Hidalgo and the addition of California and the Southwest.

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Westward Expansion and Territorial Growth of the United States

3rd Grade · Social Studies · US-MA-SS

10 lessons

Goal

Explain how transportation innovations, territorial acquisitions, and pioneer migrations expanded the United States from 1791 to 1898.

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Learning standards covered

4.T4.2Massachusetts Social Studies Standards · 5th Grade

Give examples of some of the ways the United States acquired new states (beyond the 13 original states) and additional territories between 1791 and 1898, including purchasing land called the Louisiana Territory from France, adding territory in the Southwest as a result of war with Mexico, settling a treaty with Britain to gain land called the Oregon Territory in the Northwest, purchasing Alaska from Russia, annexing Hawaii, and adding territories such as Puerto Rico as a result of a war with Spain.