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Making it the 28th state of the American Union.
Mexico considers it a reason for war. -
Occupy the disputed territory between the Nueces River and the Rio Grande River.
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Skirmish of U.S. forces against Mexican troops: it is the pretext to officially declare war.
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Backed by the people and by Congress. With the speech "American blood has been spilled on American land."
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The US won the first battle of the confict.
The U.S. Navy begins blockade in the Gulf of Mexico. -
The United States had already secured the states of Alta California and New Mexico.
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The National Guard is formed with Mexicans from 16 to 50 years of age for the defense of the nation.
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The Congress names Santa Anna -again- president of the Republic and Valentín Gómez Farías vice-president.
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Battle of La Angostura (Coahuila). There is no clear winner and General Santa Anna begins his retreat towards the center of the country.
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The National Guard troops remain in the capital used by the warring political factions to occupy the government. It is the rebellion of "the polkos".
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Combat in Mexico City. On the 13th Chapultepec Castle falls, the last bastion of the capital. The following morning the United States flag flies over the National Palace. The Mexican government moves to Querétaro.
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Mexico accepts the loss of half of its territory.
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