Which of the following is not a participant in NAFTA?

Greenland is the correct choice because it was not one of the three initial countries involved in the North American Free Trade Agreement (NAFTA). NAFTA was established to create a trilateral trade bloc between the United States, Canada, and Mexico, aimed at enhancing trade and economic cooperation among these countries. Greenland, while geographically located in North America, is an autonomous territory within the Kingdom of Denmark and has never been part of NAFTA.

The other countries mentioned—United States, Canada, and Mexico—are fundamental participants in NAFTA, since the agreement was specifically designed to facilitate trade and investment between these nations, eliminating tariffs and promoting economic collaboration. Understanding this context highlights why Greenland does not fit as a participant in the agreement.