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 correct answer is C. St. Lawrence River because it is a river in the North-East USA that separates Canada and America. The Rio Grande separates us from Mexico, while the Mississippi river is in the mid-west of the US. The Mackenzie is in North-West Canada, so it also would be incorrect.

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.

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