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190 million. Peak of the roman empire.
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Smallpox arrives in Europe for the first time, causing a decline in population compared to other time periods.
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Dhaka in Bangladesh is found causing an increase to population more place for people to live.
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End of the Geonim era in Babylonia (from 650).
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The best known bacterial disease took place. The Bubonic plague is believed by many to be the Black Death that was in Europe in the 1340s.
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1550 million. it was estimated that 4 out of every 1,000 residents of British India die of cholera each year.
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Here the worlds population was 2400 million
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600 million people. The Great Northern War begins with Russia, Denmark and Saxony/Poland making a coordinated attack on Sweden (to 1703).