In the seventeenth century the expansion of the cores changed the meanings of geography more dramatically than ever before. Centralized empires with muskets and cannons closed the Inner Asian steppe highway that linked East and West, ending nomadic migration and effectively killing one of the horsemen of the apocalypse. On the Atlantic, by contrast, the oceanic highway that western European merchants had opened fueled the rise of new kinds of markets and raised entirely new questions about how the natural world worked. By 1700 social development was again pressing the hard ceiling, but this
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