Mexico's winning independence from Spain slowed American expansion westward.

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Mexico's winning independence from Spain in 1821 actually opened up more opportunities for American expansion westward as Mexico was weakened and struggling to maintain control over its northern territories. This led to conflicts such as the Mexican-American War in 1846-1848, which resulted in the United States gaining control of much of modern-day western US, including California, Arizona, New Mexico, and Texas.

Mexico's Winning Independence from Spain Slowed American Expansion Westward