Source: The Evolution of Civilizations (1961) (Second Edition 1979), Chapter 10, Western Civilization, p. 334
“If a test of civilization be sought, none can be so sure as the condition of that half of society over which the other half has power.”
Women, vol. 3, Society in America (1837).
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Harriet Martineau 6
English writer and sociologist 1802–1876Related quotes

“One half of my life has put the other half in the grave.”
La moitié de ma vie a mis l’autre au tombeau.
Chimène, act III, scene iii.
Le Cid (1636)

ME 13:364
1810s, Letters to John Wayles Eppes (1813)

“I can hire one half of the working class to kill the other half.”
Frequently attributed, often in the context of strikebreaking activities during the Great Southwest Railroad Strike of 1886. See for example Philip Sheldon Foner, History of the Labor Movement in the United States, Volume 2 - Page 50 (1975). A contemporary source has not been identified. Varying forms of the quotation circulated in the labor press as early as 1893, with or without the attribution to Gould.
Attributed
Source: The Phoenix and the Mirror (1969), Chapter 10

Feb. 15, 1766, p. 145
Life of Samuel Johnson (1791), Vol II

"Petty Notes on Some Sex in America" first published in Playboy magazine (1961 - 1962)
Cannibals and Christians (1966)

"Meryl Streep's British ancestor 'helped start war with Native Americans," 2012