Which country shares the southern border of the united states?
a. canada
b. mexico
c. ontario
d. greenland

what type of government does canada have?
a. socialist democracy
b. parliamentary democracy
c. constitutional monarchy
d. federal republic

which region of the united states is the most populated?
a. northeastern u. s.
b. midwestern u. s.
c. southern u. s.
d. the pacific states