The Country that shares the southern Border with the US is Canada.
Two countries share a border with the United States. To the north, the US shares a border with Canada. To the south, the US shares a border with Mexico.
CanadaCanada shares the longest border with the US.
mexico and do
The US
The only Latin American country that shares a border with the United States is Mexico.
Canada and Mexico
Both Canada and Mexico border the US.
Both the US state and the country border each other.
Mexico
Alaska, as it shares a border with Canada that extends for about 1,538 miles.
Too many to name them all, twelve in the US north and four in the south.