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      last updated: 2003-11-12T22:25:16Z
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([[32nd century BC]] - '''31st century BC''' - [[30th century BC]] - [[Centuries|other centuries]])

([[5th millennium BC]] - '''[[4th millennium BC]]''' - [[3rd millennium BC]])
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'''Events''':
* 3000 BC - [[Menes]] unifies [[Upper Egypt|Upper]] and [[Lower Egypt]], and a new capital is erected at [[Memphis, Egypt|Memphis]].

'''Significant persons''':
* [[Ur-nina]] first king of [[Lagash]] in [[Mesopotamia]]

'''Inventions, Discoveries, Introductions''':
* [[Chinese language|Chinese]] [[ideogram]]s
* [[Drainage]] and [[sewage]] system in [[India]] 
* [[Dam]]s, [[canal]]s, [[stone sculpture]]s 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 (script)|cuneiform]] writing was invented in [[Mesopotamia]].

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====References====
* Adapted from the [[Wikipedia]] article, "31st_century_BC" [http://en.wikipedia.org/wiki/31st_century_BC http://en.wikipedia.org/wiki/31st_century_BC], used under the [[GNU Free Documentation License]]