The Harappan lived 5200 years ago in the Indus valley in huge complicated cities before the society eventually disappeared. Now it seems that two droughts in short succession could have been responsible for the downfall
Source:
https://www.newscientist.com/article/2261018-double-climate-disaster-may-have-ended-ancient-harappan-civilisation/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home