Washington
Rio Grande forms the Southern border of the United states.
Canada
Canada
Canada
The country that forms most of the northern border of the United States is Canada. The country directly to the south is Mexico.
The country that forms most of the northern border of the United States is Canada. The country directly to the south is Mexico.
Canada.
Canada forms the northern border of the contiguous 48 states of the United States.
The largest country in the world: Canada
The largest country in the world: Canada
There are two countries that form the borders of the United States: Canada and Mexico. Canada forms the northern border of the United States and Mexico forms the Southern border of the United States.
Kentucky forms most of the northern border of Tennessee.