First of all, South America is a continent, or at least a region of the Americas. It is not a country. Second, of the two, Canada borders the US.
No country borders Italy to the south.
Trinidad is an island therefore no country in South America borders it.
Mexico borders to the south of the United States.
It depends on what country is being referred to. Mexico borders the United States on the south. The United States borders Canada to the south. China borders Mongolia on the south.
Germany borders from the South side of Denmark.
Tanzania borders Kenya to the south.
south of South Sudan
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This country is Italy.
Canada borders the north, Mexico borders the south.
Mexico borders the Mountain States on the south.