History By Period
Human history, also called world history, is the narrative of humanity's past. It is understood and studied through anthropology, archaeology, genetics, and linguistics. Since the invention of writing, human history has been studied through primary and secondary source documents. Humanity's written history was preceded by its prehistory, beginning with the Paleolithic ("Old Stone Age") era. This was followed by the Neolithic ("New Stone Age") era, which saw the Agricultural Revolution begin in the Middle East around 10,000  BCE. During this period, humans began the systematic husbandry of plants and animals. As agriculture advanced, most humans transitioned from a nomadic to a settled lifestyle as farmers in permanent settlements. The relative security and increased productivity provided by farming allowed communities to expand into increasingly larger units, fostered by advances in transportation. The earliest complex societies appeared in fertile river valleys. As ...
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