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The Adams-Onis Treaty is signed by the U.S. and Spain. It established the border between the U.S. and Mexico and gave the U.S. Florida.
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They officially name themselves the United States of Mexico, become a representative federal republic, and make Catholicism the national religion.
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The colonists declare that they will fight to have Mexico's 1824 constitution modified, and to become an independent Mexican state.
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Texas declares independence and becomes the Republic of Texas.
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Polk orders Zachary Taylor to move his troops to the mouth of the Rio Grande. There they occupy land that Mexico had claimed as their own. Americans who were against the annexation of Texas and war with Mexico considered this to be a poor decision that ultimately instigated the war.
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Mariano Parades y Arrillaga (the dictator of Mexico at the time) orders an attack on Taylor's army at the Rio Grande. The commander at Matamoros delays the attack; instead of waiting, Parades firers him and gets a new commander.
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Mexicans attacked U.S. soldiers on U.S. side of the Rio Grande.
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President Polk puts war declaration before Congress.
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