The world of Robert Silverberg's 'The Gate of Worlds'. From the Alternate Cartography site.

The Black Death killed three fourths of the European population, delaying progress and, ultimately, the Industrial Revolution. Most of Central Europe was conquered by the Turks, leaving it in no shape for colonization. It allowed non-European powers to emerge: Aztecs,Incas, Russia and Japan are now, along with Turkey, the main powers

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