Mexico.
The country that lies to the west of Texas is Mexico. Mexico is separated from Texas by the Rio Grande River.
No. Both countries are separated by most of Central America (Guatemala, Honduras, El Salvador, Costa Rica, Panama).
The Baja California peninsula.
Quebec has not separated.
There are no countries in Mexico, Mexico is a country.
Mexico IS a country.
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.
The Rio Grande river.