Mexico is the closest country south of the US, as it borders the US to the south.
Mexico is the country located south of the us
There is no country below the US, however Mexico borders it to the south
The US is bordered to the south by Mexico.
The US is bordered to the south by Mexico.
Mexico is the country on the southern border of the US
mexico
Mexico is the only country south of the western United States.
Mexico is the country south of the United States.
Canada is north of the US and Mexico is south of the US.
Mexico
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