The Indus Valley Civilization was one of the world's earliest civilizations, along with ancient Egypt and Mesopotamia. It flourished between 2500 and 1900 BC, and at its peak, the civilization may have had a population of over five million people.
The Indus Valley Civilization was a highly advanced society, with a well-developed system of writing, art, architecture, and technology. The people of the Indus Valley Civilization were skilled farmers, and they also engaged in trade with other civilizations.
The Indus Valley Civilization declined around 1900 BC, for reasons that are still not fully understood. Some scholars believe that the decline was due to a combination of factors, including climate change, invasion, and warfare.