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Between 12,000 and 2000 BCE, tribes of these people further migrated and settled throughout Peru. Between 1200 BCE and 200 CE people began to settle in villages and began creating more permanent crafts, such as ceramics and weavings. Temples and pyramids began to be constructed of carved stone. These special buildings were used for the worship of their gods. The Inca Empire was established by the year 1200 CE.
The problem is, how do you calculate how many have ever lived, and where do you start? One group to have done the work is the Population Reference Bureau in Washington. Wendy Baldwin from the Bureau says that the normal starting point is when Homo sapiens first walked the earth, about 50,000 years ago. So you have a starting point and an end figure but it's the time in between that causes the problems. For 99% of that time there is no data, she says.