The U.S. (both countries have a common border).
Canada and Mexico both border the US. The Caribbean countries as well as the Central American ones are also fairly close.
Mexico and Canada
Canada is larger than both the US and Mexico.
Canada is a country. Chicago and Miami are US ciities and New Mexico is a US State.
North-Canada South-Mexico
Mexico
Mexico is the only country which borders the US to the south & Canada borders to the North.
Mexico is the immediate neighbor to the United States, just south of that country. As Paraguay is a South American country, to visit the United States you would have to pass through or fly over Mexico. Therefore, Paraguay is closer to Mexico than to the US.
Canada and Mexico
Yes... Canada and Mexico
Canada, us, mexico
Mexico and Canada both share borders with the US.