Title: Establishing Borders: The Expansion of the United States, 1846-48
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Content: Texas became a state, Mexico lost nearly all its territory, and Britain gave up its claim to the Oregon Country below the 49th parallel. 6. Stress that between 1846 and 1848 the United States gained more than one million square miles of territory. Be sure to note that the United States acquired Oregon Country peacefully through a treaty with Britain, while it took a war with Mexico to obtain the lands in the Southwest. 7. Use Map 1B and a current map of the United States to identify which states were later formed from the territory acquired from Mexico. California, Nevada, Utah, New Mexico, Arizona, and portions of Colorado, Wyoming, Oklahoma, and Kansas were formed from this territory. Identify which states were later formed from the territory acquired from Britain. Washington, Oregon, Idaho, and portions of Wyoming and Montana were formed from this territory.