The serves as a border between the northeastern united states and canada.
a.
mackenzie river
b.
mississippi river
c.
st. lawrence river
d.
rio grande

The St. Lawrence River serves as a border between the Northeastern United States and Canada. The St. Lawrence River is located in the middle latitude of North America. It is a large river that flows north-easterly direction. It serves as an international boundary between Canada, Ontario and US.

the answer wold be b) travel among nations should be regulated by an international organization

what the first or next guy says