These countries are international peacekeepers.

Mexico
Canada
Greenland
U.S.

There are several countries that participate in international peacekeeping missions. While Mexico, Canada, and the United States are active contributors, Greenland is not officially recognized as an independent country and does not have its own military or participate in peacekeeping operations. However, Greenland is an autonomous territory of Denmark and it falls under Denmark's participation in international peacekeeping efforts.