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In page Demimonde:

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Historically, the height of the demimonde was encapsulated by the period known in France as La Belle Époque (1871–1914), from the end of the Franco-Prussian War to the beginning of World War I.[citation needed] The twentieth century brought the rise of the New Woman, changing economies and social structures, as well as changing fashions and social mores, particularly in the aftermath of World War I. Prostitution and the keeping of mistresses did not disappear, but the label demimondaine became obsolete as the 'half-world' changed.