effective working population
41postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… …
42Social Security (United States) — This article is about the retirement/disability program. For the general concept of providing welfare, see Social security. For other uses, see Social Security (disambiguation) …
43South America — South American. a continent in the S part of the Western Hemisphere. 271,000,000; ab. 6,900,000 sq. mi. (17,871,000 sq. km). * * * Continent, Western Hemisphere. The world s fourth largest continent, it is bounded by the Caribbean Sea to the… …
44birth control — regulation of the number of children born through the deliberate control or prevention of conception. Cf. family planning (def. 1). [1914, Amer.] * * * Voluntary limiting of human reproduction, using such means as contraception, sexual abstinence …
45Europe — /yoor euhp, yerr / for 1; /yoo roh pee, yeuh / for 2, n. 1. a continent in the W part of the landmass lying between the Atlantic and Pacific oceans, separated from Asia by the Ural Mountains on the E and the Caucasus Mountains and the Black and… …
46Greece, history of — ▪ Byzantine to modern Introduction history of the area from the Byzantine (Byzantine Empire) period, beginning about AD 300, to the present. For earlier periods, see Aegean civilizations; ancient Greek civilization; and Hellenistic Age.… …
47France — This article is about the country. For a topic outline on this subject, see List of basic France topics. For other uses, see France (disambiguation). Infobox Country native name = La République Française conventional long name = The French… …
48Dundee — For other uses, see Dundee (disambiguation). Coordinates: 56°27′50″N 2°58′12″W / 56.464°N 2.970°W / 56.464; 2.970 …
49Manhattan — New York Island redirects here. For the Pacific island, see Teraina. For other uses, see Manhattan (disambiguation). Manhattan   Borough of New York City   New York County …
50Colorado Labor Wars — Colorado s most significant battles between labor and capital occurred primarily between miners and mine operators. In these battles the state government, with one clear exception, always took the side of the mine operators. Additional… …
