Texas, New Mexico, Arizona, California
In the southwestern region of the United States, four states share a border with Mexico: California, Arizona, New Mexico, and Texas. Given that the southwest region typically includes these four states, the fraction of states in this region that border Mexico is 4 out of 4, or 100%.
Too many to name them all, twelve in the US north and four in the south.
The states in the region that share an international border are [insert specific states that share a border].
California, Arizona, New Mexico, and Texas are the US states on the border with Mexico.
The four States are: # Maryland # Massachusetts # Mississippi # Missouri
Alaska and Hawaii are the only two states that do not share a border with another state.
Michigan, Pennsylvania, West Virginia, Kentucky and Indiana.
California and Oregon did not share a border with the 21 other Union states.
Hawaii and Alaska
the state that shares a border with Russia
Kentucky and Virginia
Only three countries share a border with Luxembourg. They are Belgium, France, and Germany.