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Rio Grande
The proximate cause of the Mexican-American War was the disagreement over whether the boundary between Mexico and Texas was the Rio Grande or the Nueces River, which was significantly farther up the coast. The Treaty of Guadalupe Hidalgo, which ended the war in 1848, established the Rio Grande as the border, which runs from Ciudad Juarez, in Chihuahua and El Paso, Texas, to the Gulf of Mexico. The border divides Texas from the Mexican states of Chihuahua, Coahuila, Tamaulipas, and Nuevo Leon. A small stretch of the Rio Grande also defines part of the New Mexico–Mexico border.
Known in Mexico as the Rio Bravo del Norte, or Rio Bravo, the Rio Grande arises at the Continental Divide in the San Juan Mountains of southwestern Colorado ...
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