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Texas borders four Mexican statesâTamaulipas, Nuevo Leon, LeÃ³n, coahuila Andâchihuahua the most of Any.U. s. State New mexico And arizona each border Two mexican (States chihuahua And; Sonora sonora And Baja, california). respectively
Formed as a break-away republic from Mexico by the Texas Revolution, the state claimed borders that encompassed an area that included all of the present U.S. state of Texas, as well as parts of present-day New Mexico, Oklahoma, Kansas, Colorado, and Wyoming based upon the Treaties of Velasco between the newly created Texas Republic and Mexico. The eastern boundary with the United States was defined by the Adams-OnÃ­s Treaty between the United States and Spain, in 1819. Its southern and western-most boundary with Mexico was under dispute throughout the existence of the Republic, with Texas claiming that the boundary was the Rio Grande, and Mexico claiming the Nueces River as the boundary.