Mexico and Canada
Mexico and Canada.
The USA shares land borders with Canada to the north and Mexico to the south.
Canada in the north and Mexico in the south have land borders with the US.
Canada and Mexico
The only two countries with land borders with the US are Canada to the north and Mexico to the south.
As far as land borders, there are only two: Canada on the north and Mexico on the south.
Canada and Mexico
No continents. Two countries: Canada and Mexico
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The United States shares land borders with two countries: Canada to the north and Mexico to the south. Additionally, the U.S. has maritime boundaries with Russia, Cuba, and the Bahamas. So, in terms of land borders, the U.S. borders two countries.
Brazil borders all but two of the countries in South America.