Wisconsin, Pennsylvania, Ohio, New York,Minnesota, Michigan, Illinois and Indiana.
A superpower is a country which is very strong internationally and which exercises its power and influence on the neighboring countries.
Among the options, Greenland has too small population to be a superpower, and Mexico is a developing economy still. Both US and Canada are strong economically, but it's the superpower.
Early contact with other nations
For every action there is an equal and opposite reaction.
That
is newtons 3rd law
the united states I believe :)