Etymology
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miscegenation (n.)

"interbreeding of races," applied originally and especially to sexual union between black and white individuals, 1863, coined irregularly by U.S. journalist David Goodman Croly from Latin miscere "to mix" (from PIE root *meik- "to mix") + genus "race," from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups. It first appeared in "Miscegenation: The Theory of the Blending of the Races, Applied to the American White Man and Negro," a pretended anti-Abolitionist pamphlet Croly and others published anonymously in advance of the 1864 U.S. presidential election. The old word was amalgamation.

The design of "Miscegenation" was exceedingly ambitious, and the machinery employed was probably among the most ingenious and audacious ever put into operation to procure the indorsement of absurd theories and give the subject the widest notoriety. The object was to so make use of the prevailing ideas of the extremists of the Anti-Slavery party, as to induce them to accept doctrines which would be obnoxious to the great mass of the community, and which would, of course, be used in the political canvass which was to ensue. [P.T. Barnum, "The Humbugs of the World," 1866; he also writes that, despite the pamphlet being an ingenious and impudent literary hoax, the word "has passed into the language and no future dictionary will be complete without it."]
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miscegenate (v.)

"to mix races," originally and especially to breeding between black and white, 1863 (Croly); see miscegenation. Related: Miscegenated; miscegenating.

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variety (n.)

1530s, "change of fortunes," from French variété and directly from Latin varietatem (nominative varietas) "difference, diversity; a kind, variety, species, sort," from varius "various" (see vary). Meaning diversity, absence of monotony" is from 1540s; that of "collection of different things" is from 1550s; sense of "something different from others" is from 1610s. In reference to music hall or theatrical performances of a mixed nature, first recorded 1868, American English. The U.S. theater and entertainment industry magazine was founded in 1905 by Sime Silverman.

Variety's grammar is barbarous; its style is original and unique and completely independent of any other writing; its phraseology is wild and revolutionary and its diction is the result of miscegenation among shop talk, slang, Broadway colloquialisms, sporting neologisms and impatient short-cutting. [Hugh Kent, "Variety," American Mercury, December 1926] 
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