31st century BC

(32nd century BC – 31st century BC – 30th century BC – other centuries) (5th millennium BC – 4th millennium BC – 3rd millennium BC)\n----\n

Table of contents

1 Events 2 Significant persons 3 Inventions, discoveries, introductions

Events

\n* 3000 BC – Menes unifies Upper and Lower Egypt, and a new capital is erected at Memphis.\n* 3000 BC – Highly developed cities were to be found in the Indus valley civilization. See also Punjab and History of the Punjab.

Significant persons

\n* Ur-nina first king of Lagash in Mesopotamia

Inventions, discoveries, introductions

\n* Chinese ideograms\n* Drainage and sewage system in India \n* Dams, canals, stone sculptures using inclined plane and lever in Sumer\n* Pyramids in Ancient Egypt\n* Copper was in use, both as tools and weapons.\n* Crude writing existed in Egypt, and cuneiform writing was invented in Mesopotamia.