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Nomadic people first begin to settle in Mesopotamia. These people eventually became the first civilizations in Mesopotamia.
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Dionysius Exiguus publishes the Dionysius Exiguus' Easter table. This initiated the Anno Domini era, used for the Gregorian and Julian calendars.
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Naming of the city by the Emperor Constantine as the capital of the Roman Empire (as Nova Roma, later Constantinople).
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The steam engine is invented. Thomas Newcomen invents the first steam engine. It is not very useful yet, but the idea of using steam to make machines go will be important to the Industrial Revolution.
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Morse develops the telegraph and Morse Code. Great Western--first ocean-going steamship.
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Henry Ford mass-produces the Model T.
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With 35 million people, the metropolitan area of Tokyo was by far the most populous
urban agglomeration in the world.