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The Adams-Onís Treaty was the result of the negotiation between Spain and the United States to establish the border between the North American nation and the then viceroyalty of New Spain.
Spain gave up Oregon, it also gave up the Floridas, Louisiana and navigation on the Mississippi River. The Spanish Crown remained as the sole sovereign of Texas, although it was signed in 1819, it was not rectified until February 22, 1821 -
Texas was part of the state of Coahuila, Mexico rejected several offers from the United States to buy Texas.
Texas was colonized by Austin taking 300 families, the invasion of Anglos and the desire to continue practicing slavery, gave the first signs of what would be the independence of Texas. -
General Antonio Lòpez de Santa Anna is taken prisoner and forced to sign the Velasco treaty that establishes the independence of Texas.
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Texas promulgates its independence on April 21, 1836, in response to a military campaign by Antonio Lòpez de Santa Anna to regain Texas.
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In 1845, fearing a possible reconquest of Texas by Mexico, I decided to join the United States of America.
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President James Polk sends troops to the disputed Mexican territories on April 24, 1846. There is talk of New Mexico and Chihuahua.
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On February 2, 1848, the armed clash between the two countries was terminated and the Guadalupe Hidalgo treaty was signed, where Texas was renounced, recognizing the Velasco treaty and Santa Fe, New Mexico, and Upper California were ceded.
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The border with México would be finalized with the Gadsden Purchase of 1853 u del wich 30,000 additional square miles of northern Mexican territory were bought by the US for 10 million (now southern Arizona and southern New Mexico)
