Answer: North Atlantic Treaty Organization (NATO)
Step-by-step explanation:
NATO is an intergovernmental military alliance between 29 North American and European countries. It was established on April 4, 1949. The purpose of NATO is to provide military aid to each member state if attacked, with armed forces if necessary.
Of the 29 member countries, two are located in North America: the USA and Canada, 26 are in Europe and one is in Eurasia (Turkey).
The most recent member state to be added to NATO is Montenegro on June 5, 2017.