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.
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Mexico
Canada does
The US
Both Canada and Mexico border the US.
The only Latin American country that shares a border with the United States is Mexico.
They are the States that a US States shares a border with.
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Canada and Mexico