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The United States accepts Texas from Mexico and adds it to the Union.
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President Polk sent John Slidell, a Spanish-speaking ambassador, to offer Mexico $25 million for Texas, California, and New Mexico. However, Slidell's diplomacy failed.
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General Zachary Taylor stationed troops on the Rio Grande, part of disputed territory.
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On April 25, a Mexican cavalry unit crossed the Rio Grande and ambushed an American patrol and killed or wounded 16 American soldiers. Congress declared war two days later.
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In Monterrey, General Taylor and his 4,800 troops met General Santa Anna and 15,000 Mexican soldies near a ranch called Buena Vista. Santa Anna sent Taylor a note offering him the chance to surrender, but Taylor declined and won the battle after the second day of fighting.
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Mexico City surrenders as the United States takes control over it.
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In the Treaty of Guadelupe Hidalgo, it stated that the Rio Grande was the border between Mexico and America and Texas belonged to the United States.