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Finally, the independence of Mexico was achieved on September 27, 1821. After that, the mainland of New Spain was organized as the Mexican Empire. This ephemeral Catholic monarchy was changed to a federal republic in 1823, due both to internal conflicts and the separation of Central America from Mexico.
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Sam Houston and some 800 Texans defeated Santa Anna's Mexican force of 1,500 men at San Jacinto (near the site of present-day Houston), shouting “Remember the Alamo!” as they attacked
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John Tyler was the tenth president of the United States
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The Webster–Ashburton Treaty, signed August 9, 1842, was a treaty that resolved several border issues between the United States and the British North American colonies (the region that became Canada).
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The Texas annexation was the 1845 annexation of the Republic of Texas into the United States of America, which was admitted to the Union as the 28th state on December 29, 1845. ... Through secret negotiations with the Houston administration, Tyler secured a treaty of annexation in April 1844.
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Mexican cavalry attacked a group of U.S. soldiers in the disputed zone under the command of General Zachary Taylor, killing about a dozen. They then laid siege to an American fort along the Rio Grande.
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signed on February 2, 1848, ended the Mexican-American War in favor of the United States. ... Mexico also gave up all claims to Texas and recognized the Rio Grande as America's southern boundary
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Ultimately, Gadsden reached an agreement with Mexico to purchase about 30,000 square miles for $10 million. The treaty between the United States and Mexico was signed by James Gadsden on December 30, 1853, in Mexico City
