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Gama, Vasco da

(Encyclopedia)Gama, Vasco da văˈskō də găˈmə, Port. väshˈkō dä gäˈmə [key], c.1469–1524, Portuguese navigator, the first European to journey by sea to India. His epochal voyage (1497–99) was made ...

mechanized warfare

(Encyclopedia)mechanized warfare, employment of modern mobile attack and defense tactics that depend upon machines, more particularly upon vehicles powered by gasoline and diesel engines. Central to the waging of m...

tank, military

(Encyclopedia)tank, military, armored vehicle having caterpillar traction and armed with machine guns, cannon, rockets, or flame throwers. The tank, together with the airplane, opened up modern warfare, which had b...

Polo, Marco

(Encyclopedia)Polo, Marco märˈkō pōˈlō [key], 1254?–1324?, Venetian traveler in China. His father, Niccolò Polo, and his uncle, Maffeo Polo, had made (1253–60) a trading expedition to Constantinople. A w...

Hoover Dam

(Encyclopedia)Hoover Dam, 726 ft (221 m) high and 1,244 ft (379 m) long, on the Colorado River between Nev. and Ariz.; one of the world's largest dams. Built between 1931 and 1936 by the U.S. Bureau of Reclamation,...

Nevins, Allan

(Encyclopedia)Nevins, Allan, 1890–1971, American historian, b. Camp Point, Ill. After studying at the Univ. of Illinois, he followed a career in journalism until 1927. Teaching at Columbia from 1928, he became a ...

New Delhi

(Encyclopedia)New Delhi dĕlˈē [key], city (1991 pop. 294,149), capital of India and of the National Capital Territory of Delhi, N central India, on the right bank of the Yamuna River. Predominantly an administra...

livery companies

(Encyclopedia)livery companies, London trade guilds incorporated by royal charter, deriving their name from the assumption of distinctive dress (livery) by their members. Edward III granted the first charters in th...

social science

(Encyclopedia)social science, term for any or all of the branches of study that deal with humans in their social relations. Often these studies are referred to in the plural as the social sciences. Although human s...

Tacna-Arica Controversy

(Encyclopedia)Tacna-Arica Controversy täkˈnə-ərēˈkə [key], 1883–1929, dispute between Chile and Peru. It arose from provisions of the Treaty of Ancón (1883), which ended the War of the Pacific (see Pacifi...