With no natural borders save the Arctic and Pacific oceans, Russia was in a position to gratify this impulse for several centuries—marching alternately into Central Asia, then the Caucasus, then the Balkans, then Eastern Europe, Scandinavia, and the Baltic Sea, to the Pacific Ocean and the Chinese and Japanese frontiers (and for a time during the eighteenth and nineteenth centuries across the Pacific into Alaskan and Californian settlements). It expanded each year by an amount larger than the entire territory of many European states (on average, 100,000 square kilometers annually from 1552 to
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