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Rapid City
(Encyclopedia)Rapid City, city (1990 pop. 54,523), seat of Pennington co., SW S.Dak., on Rapid Creek, in an irrigated farm region served by the Bureau of Reclamation's Rapid Valley project; founded 1876 after the d...San Francisco
(Encyclopedia)San Francisco săn frănsĭsˈkō [key], city (2020 pop. 873,965), coextensive with San Francisco co., W ...aviation
(Encyclopedia)aviation, operation of heavier-than-air aircraft and related activities. Aviation can be conveniently divided into military aviation, air transport, and general aviation. Military aviation includes al...Senate, United States
(Encyclopedia)Senate, United States: see Congress of the United States. ...Health, Education, and Welfare, United States Department of
(Encyclopedia)Health, Education, and Welfare, United States Department of: see Education, United States Department of; Health and Human Services, United States Department of. ...McKinley, William
(Encyclopedia)McKinley, William, 1843–1901, 25th president of the United States (1897–1901), b. Niles, Ohio. He was educated at Poland (Ohio) Seminary and Allegheny College. After service in the Union army in t...warfare
(Encyclopedia)warfare, violent conflict between armed enemies. In modern times warfare has usually been conducted by the armed forces (e.g., army, navy, and air force) of a nation or other politically organized gro...ballistics
(Encyclopedia)ballistics bəlĭsˈtĭks [key], science of projectiles. Interior ballistics deals with the propulsion and the motion of a projectile within a gun or firing device. Its problems include the ignition a...Hay-Herrán Treaty
(Encyclopedia)Hay-Herrán Treaty hā-ĕränˈ [key], 1903, aborted agreement between the United States and Colombia providing for U.S. control of the prospective Panama Canal and for U.S. acquisition of a canal zon...Mubarak, Muhammad Hosni
(Encyclopedia)Mubarak, Muhammad Hosni hōsˈnē mo͞obəˈrək [key], 1928–2020, president of Egypt (1981–2011). Air force commander (1972–75) and vice president (1975–81) of Egypt, he became president afte...Browse by Subject
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