The only two countries with land borders with the US are Canada to the north and Mexico to the south.
Canada and Mexico.
Canada and Mexico
Canada and Mexico
Mexico and Canada
Canada in the north, and Mexico in the south.
Canada and Mexico.
Mexico and Canada
No continents. Two countries: Canada and Mexico
Canada in the north and Mexico in the south have land borders with the US.
The US and Russia.
As far as land borders, there are only two: Canada on the north and Mexico on the south.