During Texas's independence as the Republic of Texas, it claimed lands up to the Rio Grande River. Despite these claims, what was the name of the river that served as the southern border of the Texas region since the Spanish colonial era?

The Nueces River served as the southern border of the Texas region since the Spanish colonial era. The Republic of Texas claimed the lands up to the Rio Grande, which once Texas was absorbed into the United States, served as one of the triggers that started the Mexican-American War.

Asked by Jason Forbes · Last updated 5 years ago · 457 views · SOURCE