None. Presently, no US state wishes to join Mexico.
There were however, several states that used to belong to Mexico and now are part of the US. Some examples include California, Arizona, New Mexico and Texas. See the related questions section for more details.
There are more than two states that border Mexico, four do. California, Arizona, New Mexico, and Texas.
Aiezon and Mexico
Canada & Mexico, which are countries, not states.
California, Arizona, New Mexico and Texas.
The states that border Mexico are California, Arizona, New Mexico and Texas...
Canada and Mexico are the two countries that border the United States.
California and Arizona
Only one: Texas
Canada and Mexico border the United States.Canada and Mexico.
None. All four states that border Mexico (California, Arizona, New Mexico, Texas) have one, uninterrupted border with Mexico.
Both the United States and Mexico.
nevada and new mexico