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B.C.
2200 The Hsia Dynasty was founded in China, with domesticated horses, and cultivation of rice and millet, it was the first recorded dynasty
2200 Barbarian Gutians from what is now Iran invaded Sumer and destroyed the capital city of Agade (in Akkad)
2200 People in Central America make pottery
2200 A map of the Mesopotamian city of Lagash is carved in stone in the lap of a statue of a god; it is the oldest surviving map of a city.
2175 Gudea rules Lagash
2175 The oldest preserved standard of length is the foot of a statue of the ruler Gudea of Lagash; it is divided into 16 parts and is 10.41 inches long.
2170 The Sumerians use a 360-day year, 12-month solar calendar along with a 354-day lunar calendar; the calendar has an extra month every eight years to keep it in step with the seasons.
2150 Eighty bluestones are set up (two circles) at Stonehenge (England)
2150 Queen Semiramis builds a tunnel below the Euphrates River linking the royal palace of Babylon with the Temple of Jupiter.
2110 Ur-Nammu of Ur unifies Sumer and Akkad
2100 The last dynasty of Sumer is founded by Ur-Nammu
2100 Ur is an empire and Ur-Nammu writes a rule of law (perhaps the first)
2100 Egypt moves south to establish the Middle Kingdom (7th Dynasty)
2100 Aryans invade Indus Valley