It depends on where your starting point is located. Canada? It would be the United States. Honduras or El Salvador? Guatemala is the answer.
Gallup, New Mexico is about halfway.
Farmington is a city in New Mexico.
There are no countries in Mexico, Mexico is a country.
Halfway Points
The halfway point would be Mora New Mexico. The closest major city to the halfway point is Albuquerque New Mexico.
Mexico IS a country.
The halfway driving point lies on US 285, between Roswell, New Mexico and Vaughn, New Mexico
Mexico is a country, but the capital of Mexico is Mexico city.
In the country of Mexico.
A country. Mexico is part of North America.
The country south of New Mexico is Mexico.
Mexico is a country.