Which state is the southernmost point that borders Mexico?

The southernmost point that borders Mexico is indeed Texas. Geographically, Texas extends further south than any other U.S. state that shares a border with Mexico, stretching down to the Rio Grande River, which serves as part of the border between the two countries. This allows Texas to have the southernmost entry point into the United States at the border, with cities like Brownsville located close to the southern tip of the state.

In comparison, while California, Arizona, and New Mexico also share borders with Mexico, all of these states are positioned further north than Texas. California has its southern border near Tijuana, which is north of the southernmost point of Texas. Arizona borders Mexico further to the west of Texas, and New Mexico, located above Texas, does not extend as far south as the Lone Star State. Therefore, Texas is accurately identified as the state with the southernmost point along the U.S.-Mexico border.