Question

This North American country is a superpower.
Canada
Greenland
Mexico
U.S

Answer 1

The answer is The U.S.

Answer 2

It would be the U.S, here's an example; After the dissolution of the Soviet Union in 1991 which ended the Cold War, the post–Cold War world was sometimes considered to be a unipolar world, with the United States as the world's sole remaining superpower.