The North Atlantic Treaty Organization (NATO. NATO is a multinational alliance of international military blocs founded in 1949 and headquartered in Brussels, Belgium, to counter the influence of Soviet military and ideological expansion, and the United States and its Western European counterparts to strengthen collective defense.

The North Atlantic Treaty Organization has a strong presence in North America and most of Europe. The North Atlantic Treaty Organization (NATO) has a presence in North America and most of Europe and currently has 19 member states and 23 Partnership for Peace countries. The purpose of the organization is to unite the contracting states to implement collective defense, and when any contracting state is at war with another state, the other contracting states should give assistance, including force support, etc.