4th millennium BC

Millennia:	5th millennium BC · 4th millennium BC · 3rd millennium BC
Centuries:	40th century BC · 39th century BC · 38th century BC · 37th century BC · 36th century BC · 35th century BC · 34th century BC · 33rd century BC · 32nd century BC · 31st century BC

The 4th millennium BC saw major changes in human culture. It marked the beginning of the Bronze Age and of writing.

The city states of Sumer and the kingdom of Egypt were started and grew to prominence. Agriculture spread widely across Eurasia. World population in the course of the millennium doubled to approximately from 7 to 14 million people in the area surrounding them.

Millennia:	5th millennium BC · 4th millennium BC · 3rd millennium BC
Centuries:	40th century BC · 39th century BC · 38th century BC · 37th century BC · 36th century BC · 35th century BC · 34th century BC · 33rd century BC · 32nd century BC · 31st century BC

4th millennium BC

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