Which country shares the southern border of the United States?

ACanada

BMexico

COntario

DGreenland

What type of government does Canada have?

Asocialist democracy

Bparliamentary democracy

Cconstitutional monarchy

Dfederal republic

Which region of the United States is the most populated?

Anortheastern U.S.

Bmidwestern U.S.

Csouthern U.S.

Dthe Pacific states