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Cesar Chavez Day: California

Honoring the life of Cesar Chavez by Liz Olson Cesar Chavez Day celebrates the birthday of Latino labor leader Cesar Chavez. California established the state holiday to promote…

U.S. History Timeline: 1850–1899

Top of Page Source: Getty ImagesThe Civil War and the Reconstruction period that followed are among the signal events of American History. The roots of the conflict run deep, and its effects are…

migrant labor

(Encyclopedia) migrant labor, term applied in the United States to laborers who travel from place to place harvesting crops that must be picked as soon as they ripen. Although migrant labor patterns…

Oppenheimer, J. Robert

(Encyclopedia) Oppenheimer, J. RobertOppenheimer, J. Robertŏpˈənhīˌmər [key], 1904–67, American physicist, b. New York City, grad. Harvard (B.A., 1925), Ph.D. Univ. of Göttingen, 1927. He taught at…

Nevada

(Encyclopedia) CE5 NevadaNevadanəvădˈə, –vä– [key], far western state of the United States. It is bordered by Utah (E), Arizona (SE), California (SW, W), and Oregon and Idaho (N). In the…

hot spring

(Encyclopedia) hot spring, natural discharge of groundwater having an elevated temperature. Most hot springs result from the emergence of groundwater that has passed through or near recently formed,…

Jennings, Herbert Spencer

(Encyclopedia) Jennings, Herbert Spencer, 1868–1947, American zoologist, b. Tonica, Ill., B.S. Univ. of Michigan, 1893, Ph.D. Harvard, 1896. He was professor of zoology at Johns Hopkins (1906–10) and…

Rivas

(Encyclopedia) Rivas, town (1995 est. pop. 22,255), SW Nicaragua. It is on the Isthmus of Rivas, a narrow land strip between Lake Nicaragua and the Pacific Ocean. Rivas is the commercial center of a…