Question

About how many years of human existence passed before the world population reached its first billion? What factors restricted population before that time. and what factors contributed to growth after that point?

Answer 1

It took approximately 180,000 years of human existence for the world population to reach its first billion. Before that point, population growth was restricted by a number of factors such as wars, epidemics, famine, and harsh climates. After the first billion, population growth was facilitated by advances in agriculture and food production, improved sanitation and health care, and increased trade and economic development. Additionally, increased immigration and urbanization, combined with declining mortality rates, helped to fuel the rapid population growth that has been seen in the past two centuries.

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