NATO
The North Atlantic Treaty Organization (sometimes known as the North Atlantic Alliance, the Atlantic Alliance or the Western Alliance), also simply called NATO is a military alliance mostly in Europe and North America. It was established by the North Atlantic Treaty in 1949 and it was signed in Washington, DC, United States, on April 4, 1949. Its headquarters are in Brussels, Belgium. Its other official name means the same in French: Organisation du traité de l'Atlantique nord (OTAN).