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The Adams–Onís Treaty of 1819 established the southern and western boundaries of the territory with the Spanish territories of Tejas and Santa Fe de Nuevo México.
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With the Adams–Onís Treaty of 1819, the United States and Spain settled border disputes between the Territory of Missouri and Santa Fé de Nuevo Méjico and Tejas.
In 1820, Austin traveled to Presidio San Antonio de Bexar in Spanish Texas and presented a plan to colonize Texas with Anglo-Americans to Governor Antonio María Martínez.