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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,...

World Meteorological Organization

(Encyclopedia)World Meteorological Organization (WMO), specialized agency of the United Nations; established in 1950 with headquarters at Geneva, it became affiliated with the United Nations a year later. It replac...

World Trade Organization

(Encyclopedia)World Trade Organization (WTO), international organization established in 1995 as a result of the final round of the General Agreement on Tariffs and Trade (GATT) negotiations, called the Uruguay Roun...

American Colonization Society

(Encyclopedia)American Colonization Society, organized Dec., 1816–Jan., 1817, at Washington, D.C., to transport free blacks from the United States and settle them in Africa. The freeing of many slaves, principall...

North American Nebula

(Encyclopedia)North American Nebula, bright diffuse nebula in the northern constellation Cygnus about 1000 light-years away; cataloged as NGC 7000. It has a configuration resembling parts of Canada and the United S...

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...

American Revolution

(Encyclopedia)American Revolution, 1775–83, struggle by which the Thirteen Colonies on the Atlantic seaboard of North America won independence from Great Britain and became the United States. It is also called th...

Inter-American Highway

(Encyclopedia)Inter-American Highway, c.3,400 mi (5,470 km) long, section of the Pan-American Highway system from Nuevo Laredo, Mexico, to Panama City, Panama. Much of the highway prior to 1941 had been built by th...

American Geographical Society

(Encyclopedia)American Geographical Society (AGS), oldest geographical society in the United States, founded 1852 in New York City. Its purpose is to advance the science of geography through discussion and publicat...

All-American Canal

(Encyclopedia)All-American Canal, 80 mi (129 km) long, SE Calif.; part of the federal irrigation system of the Hoover Dam. Built between 1934 and 1940 across the Colorado Desert, the canal is entirely within the Un...