Respuesta :
the dispute over the border between the U. S. and Mexico
The U.S. claimed the Rio Grande as its border, while Mexico. claimed Nueces River as it's border, and on April 25, 1846 both armies met at the Rio Grande and the Mexican American War began.
The U.S. claimed the Rio Grande as its border, while Mexico. claimed Nueces River as it's border, and on April 25, 1846 both armies met at the Rio Grande and the Mexican American War began.