Question

How did we knew about prehistory?

Answer 1

with the help of archeological sources

Answer 2

Human prehistory is the period between the use of the first stone tools. 3.3 million years ago by hominids and the invention of writing systems. The earliest writing systems appeared 5,000 years ago, but it took thousands of years for writing to be widely adopted, and it was not used in some human cultures until the 19th century or even until the present. The end of prehistory therefore came at very different dates in different places, and the term is less often used in discussing societies where prehistory ended relatively recently.....

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