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The U.S got a full complete nation and expanded to get two more states to its collection.

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The Mexican soldiers killed 11 U.S soldiers. In 1846, Polk ordered colonel Stephen Kearny and his troops to march from fort Leavenworth, Kansas,  to Santa Fe, New Mexico. Where they met there a New Mexican contingent. New Mexico fell to the U.S without a shot.

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After about a year of fighting, Mexico finally conceded defeat. The U.S. and Mexico the Treaty of Guadalupe Hidalgo. Rio Grande became the border between Texas and Mexico. Mexico ceded the New Mexico and California territories to the United States.

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The war took place all over Mexico.

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The real cause of this war was because the Americans violated Mexico's territorial rights.

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The war in 1845 involved the Mexicans and the Americans.

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John C. Fremont, led an American exploration group into California which violated Mexico's territorial rights. Therefore, Mexican troops crossed to Rio Grande and killed 11 U.S. soldiers. Polk, the U.S. president at the time, called for a war and congress approved it.

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The Mexican American War started in 1845.