31st century BC

(32nd century BC – 31st century BC – 30th century BC – other centuries)

(5th millennium BC – 4th millennium BC – 3rd millennium BC)

Events

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

Significant persons

• Ur-nina first king of Lagash in Mesopotamia

Inventions, discoveries, introductions

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