Decline
- The Indus Valley Civilization declined from about 1900 BCE.
- Changes in climate, decline of the trade with Mesopotamia, and the drying of the river and water resources due to continuous drought are some of the reasons attributed by historians for the decline.
- Invasions, floods and shifting of the river course are also cited as reasons for the ruin of Indus civilization.
- According to Krishna Rajan, people may have left the cities due to the economic downturn.
- Researchers Henry Heroes, Asko Barbola Iravadham Mahadevan also identified similarities between the Indus Valley Script and Dravidian / Tamil Languages.