Right.
Gulf of Mexico Gulf of Mexico
The Gadsden Purchase in 1853, including southern New Mexico and Arizona.
It is the southern border for Texas; conversely, it is the northern border for Mexico.
It was the Gadsden Purchase, including present-day southern Arizona and New Mexico.
The Atlantic Ocean forms the eastern boundary of the Southeast, while the Gulf of Mexico forms the southern boundary.
The Nueces River.
Canada is the northern boundary of the US, while Mexico is the southern boundary. The geographical features that serve as boundaries include the Great Lakes and St. Lawrence River to the north, and the Rio Grande River to the south.
The border
The Gulf of Mexico
Mexico refused to recognize the rio grade as the southern and western boundary of texas
Mexico City is the capitol of Mexico, which borders the USA
The closest southern neighbor would be Mexico.