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First census ever in human history: There was a population of 4, 063, 000. Cities and towns formed, and the family became more important to hold down routes.
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An epidemic of bubonic plague, a disease caused by the bacterium Yersinia pestis that circulates among wild rodents where they live in great numbers and density. Populaon dropped fr 60 million to 40 million.
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At the dawn of the Industrial Revolution in the mid 1700s, the world's human population grew by about 57 percent to 700 million. It would reach one billion in 1800. It made it easier for people to move to cities, and have a life outside of farming. The middle class would grow during this time period.
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The dawn of the 21st century has allowed for people to migrate, for people to live longer, and the population to grow. For the first time in 2011 the population would hit 7 billion. Now it is around 7.6 billion.
