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Which is the biggest civilization?
One of the great civilizations of the ancient world is called simply the Indus or Harappan civilization. Thousands of years ago, it may have boasted up to 5 million people, almost 10 percent of the world's population, spread over a region that encompassed parts of today's India, Pakistan, Iran and Afghanistan. But its grand walkways (with sophisticated roadside drainage), metallurgy shops, and massive, multistory, brick hives of houses were abandoned over 3,000 years ago. It's likely that this ancient civilization, like the Maya, suffered from gradual changes in rainfall patterns that made it difficult for its peoples to raise enough food for their massive population.


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