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The United States of America
USA is the closest southern neighbor of Canada.
Mexico
Mexico
krista and edward
Mexico is the southern country that is the closest neighbor to the United States. Mexico has a border with the United States that has a total length of 1954 miles.The country is Mexico.
It depends on which country you live in. In the United states, the closest countries are Cuba and Mexico.
Mexico.
China shares its northern border with countries like Mongolia, Russia, Kazakhstan, and North Korea.
which civilization was closest neighbor
Mexico.
Tibet's closest neighbor is Nepal.