The Republic of Texas was a
sovereign state in
North America between the
United States and
Mexico that existed from 1836 to 1845. Formed as a break-away republic from Mexico as a result of the
Texas Revolution, the nation 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-Onís 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. This dispute would later become a trigger for the
Mexican–American War, after the
annexation of Texas.
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