Over 500 cities worldwide now have over 1,000,000 (1 million) people. For most of human history, cities were the exception not the rule, but the expansive growth of humans congregating within cities has exploded over the past 250 years. Prior to the 19th century, few people ever left the village in which they were born. Abruptly, farming became less and less common as industry and the economy shifted into factories located within cities, placed where money was earned and spent. The Black Marble ...
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