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The United States declares war on Mexico, triggering a conflict that forces the
Featured Event 1846 Event

May 13

War Declared on Mexico: Texas Expansion Begins

The United States declares war on Mexico, triggering a conflict that forces the nation to seize nearly half of its southern territory through the Treaty of Guadalupe Hidalgo. This territorial expansion cements American dominance across the continent while igniting fierce debates over slavery that accelerate the path toward civil war.

May 13, 1846

180 years ago

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