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World's Columbian Exposition

(Encyclopedia)World's Columbian Exposition, held at Chicago, May–Nov., 1893, in commemoration of the 400th anniversary of the discovery of America by Christopher Columbus. Authorized (1890) by Congress, it was pl...

World War II

(Encyclopedia)World War II, 1939–45, worldwide conflict involving every major power in the world. The two sides were generally known as the Allies and the Axis. Although hostilities came to an end in Sept...

World Wide Web

(Encyclopedia)World Wide Web (WWW or W3), collection of globally distributed text and multimedia documents and files and other network services linked in such a way as to create an immense electronic library from w...

Council for Mutual Economic Assistance

(Encyclopedia)Council for Mutual Economic Assistance (COMECON or MEA), international organization active between 1956 and 1991 for the coordination of economic policy among certain nations then under Communist domi...

International Maritime Organization

(Encyclopedia)International Maritime Organization (IMO), specialized agency of the United Nations established in 1948, with headquarters in London and 168 member nations and three associate members. IMO is one of t...

health maintenance organization

(Encyclopedia)health maintenance organization (HMO), type of prepaid medical service in which members pay a monthly or yearly fee for all health care, including hospitalization. The term “health maintenance organ...

Palestine Liberation Organization

(Encyclopedia)Palestine Liberation Organization (PLO), coordinating council for Palestinian organizations, founded (1964) by Egypt and the Arab League and initially controlled by Egypt. Composed of various guerrill...

Warsaw Treaty Organization

(Encyclopedia)Warsaw Treaty Organization or Warsaw Pact, alliance set up under a mutual defense treaty signed in Warsaw, Poland, in 1955 by Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland, Romania,...

Shanghai Cooperation Organization

(Encyclopedia)Shanghai Cooperation Organization (SCO), association of Eurasian nations founded 2001 in Shanghai by China, Kazakhstan, Kyrgyzstan, Russia, Tajikistan, and Uzbekistan. Under the charter signed in 2002...

North Atlantic Treaty Organization

(Encyclopedia)North Atlantic Treaty Organization (NATO), established under the North Atlantic Treaty (Apr. 4, 1949) by Belgium, Canada, Denmark, France, Great Britain, Iceland, Italy, Luxembourg, the Netherlands, N...