If you mean "Teotihuacan", it is in Mexico, just north of Mexico City.
United State is the country north of Mexico
A country. Mexico is part of North America.
The USA is to the north of Mexico.
mexico
Just two of them: Canada and the United States. You can count Greenland, however that is not a country but a Danish territory.
One or two, depending on your definition of continent. For most people in the world, it borders just one continent: America. For Americans and Europeans, it borders two continents: North America and Central America.
North America and Canada
North-Canada South-Mexico
The country that the U.S touches the north is, Mexico
Mexico
No. Mexico is a country in North America..