The following is a verbatim French→English translation of Duverger's own words (a 1980 statement by Maurice Duverger):
William H. Riker: [The Two-party System and Duverger's Law: An Essay on the History of Political Science, Amer. Polit. Sci. Review 76 (December 1982) 753-766] argued that actually, the theoretical link between the single-seat district plurality (winner-take-all) rule used in the US and UK, and a two-party system, really was first put forward by Henry Droop almost 90 years before Duverger did it.
More detailed discussion of Duverger law
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