The southern Texas border should stretch all the way to Rio Grande, according to the US.
One of the longest rivers in North America is the Rio Grande. Texas and Mexico are separated by the Rio Grande. America sought to expand its territory all the way to the Rio Grande during the Mexican American War. The Rio Grande was recognized by Mexico as defining America's southern border as part of the Treaty of Guadalupe Hidalgo. A natural border between two countries or areas that divide one territory from another is provided by rivers. As a result, we can say that the Rio Grande is the southernmost point of Texas.
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