Indus River Valley Civilization

The Indus River Valley Civilization (3300BCE - 1300BCE) was a massive, ancient civilization located in Southern Asia in what is now the states of Pakistan, India and Afghanistan. It was possibly the earliest advanced civilization and at one point held a quarter of the Earth's population. It also had the most advanced economy, technology, cities and agriculture in the time period in which it was around.

Demise
The exact fate of the Indus River Valley Civilization is largely unknown but several theories have been proposed. The most popular are as follows:
 * Invasions from various warrior tribes
 * Water shortages caused by mass urbanization
 * Water shortages caused by climate change
 * A string of massive earthquakes

Evidence for Anarchism
Whilst no written records or oral history exist officially 'confirming' the status of the Indus River Valley Civilization of having an anarchist structure, there are several strong clues and a lack of evidence for a state. Mainly in the existence of large communal buildings like baths and gardens. There is also no discernible power structure among buildings (i.e. no palaces or military barracks) and all houses were of roughly similar size (indicating rough economic equality). Their economy most likely resemble a mix of Mutualism and Anarcho-Communism.

Counter-Criticism
Some people believe that the Indus River Valley Civilization must have been a state owing to several standardized units of construction and well-planned cities.