When did Sumerian civilization exist and how long did it last?

Sumerian Renaissance civilization ran from roughly 4000 BCE to 1750 BCE, a span of about 2,500 years, making it one of the longest-lived and most foundational civilizations in human history.

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The Sumerians were the people of southern Mesopotamia, what is now southern Iraq, and their civilization flourished between roughly 4000 and 1750 BCE. If you pull the clock back further to the earliest cultural roots, the full history of Ancient Sumer, taken to include the prehistoric Ubaid and Uruk periods, spans the 5th to 3rd millennia BCE. That puts the very beginnings somewhere around 5000 BCE, meaning Sumerian Renaissance culture, in one form or another, endured for something close to 3,000 years.

Sumer was never a cohesive political entity, but a region of city-states, each with its own king. Think of it less like a nation and more like ancient Greece would later be: rival cities sharing a culture, a language and a set of gods, competing and cooperating at the same time.

The six periods

Archaeologists have defined six distinct periods. The first, the Ubaid Period, runs from around 5000 to 4100 BCE. The Uruk Period follows, from the end of Ubaid until roughly 2900 BCE, where we first see evidence of a more sophisticated civilization. The Early Dynastic Period, from 2900 to 2334 BCE, is marked by the Sumerian King List, a clay tablet inscribing all Sumerian kings dating back to "the beginning of time."

The Ur III period, roughly 2112 to 2004 BCE, is known as the Sumerian Renaissance. It was a final flowering of Sumerian political power before the end.

What they invented

This is the civilization that Greeks inherited through Mesopotamia, as the earlier answer touched on. The Sumerians invented the concept of the city, writing, schools, irrigation techniques, and many other aspects of civilization taken for granted today. Ancient Sumer holds the title of being the first civilization to transition from an oral to written culture, take part in a recorded war, and even conceptualize and build cities.

Writing itself was invented in Sumer at Uruk around 3600 BCE, roughly 1,600 years before the pyramids at Giza were finished. By the time construction on the Pyramids of Giza had been completed, Sumerian civilization was already at least 1,600 years old.

How it ended

An Elamite invasion and Amorite migration ended Sumerian civilization around 1750 BCE. Sumer was the region's earliest known civilization, and it was followed by a transitional period of Amorite states before the rise of Babylonia in the 18th century BCE. The Babylonians absorbed and built on everything the Sumerians had made, which is how the Epic of Gilgamesh and the base-60 number system survived long enough to reach the Greeks.

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This follows on from
Where did the Greek learn from? Where did the Romans learn from?

The ancient Greeks were voracious borrowers. Their debt to Africa was enormous and openly acknowledged by the Greeks themselves. Thales of Miletus, credited as the first Greek philosopher, studied geometry in Egypt. Pythagoras spent years there. Plato visited.

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