all the world’s major population centers on each of its continents were brought into permanent and sustained contact with one another for the first time, generating the most profound of consequences. Societies, nations, and entire regions were jolted into motion as a result, their trajectories careering like ping-pong balls in a lottery machine as they collided, with some that had earlier shown no exceptional promise suddenly rising fast and others left behind or sent reeling in sharp decline or violent demise. Vast new empires were launched, and with them were born immense movements of people
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