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Determined to acquire the land, he sent American troops to Texas in January of 1846 to provoke the Mexicans into war.
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On April 25, 1846, Mexican troops overwhelmed a U.S. scout party on the north bank of the river at Rancho de Carricitos.
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On May 13, 1846, the U.S. Congress overwhelmingly voted in favor of President James K. Polk's request to declare war on Mexico in a dispute over Texas.
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On May 18, 1846, Taylor's troops crossed the Rio Grande and entered the city of Matamoros. The occupation took place without a fight.
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The Bear Flag Revolt was a revolt by American settlers in Mexico-controlled California on June 14, 1846.
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The Americans entered Santa Fe on August 18, 1846
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United States General Zachary Taylor was victorious over Mexican General Antonio Lopez de Santa Anna in the Battle of Buena Vista on February 23, 1847.
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On March 9, 1847, U.S. forces under General Winfield Scott invaded Mexico three miles south of Vera Cruz.
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On September 14, 1847, the Americans entered the Mexican capital, and raised the American flag over Mexico City.
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This treaty signed in February 2, 1848, with Mexico ceding 55% of its territory, including the present-day states California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming