The people of the Harappa civilization, also known as the Indus Valley civilization, lived around 2500 BCE in the region that is now modern-day Pakistan and northwest India. The civilization thrived for several centuries before eventually declining and disappearing. While there is still some debate among historians and archaeologists about the exact reasons for the civilization's decline, there are several theories about what may have happened to the people of Harappa.

- Migration: One theory suggests that the people of Harappa may have migrated to other regions. It is possible that environmental factors such as changes in the course of rivers or climate shifts may have forced them to move to different areas in search of resources and better living conditions. Some evidence of Harappan presence has been found in other parts of the Indian subcontinent, indicating possible migration.

- Absorption into other cultures: Another possibility is that the people of Harappa were absorbed into other cultures or civilizations. As the Indus Valley civilization declined, other groups and empires, such as the Aryans, emerged in the region. It is possible that the Harappans intermingled with these new groups and eventually became part of their societies.

- Natural disasters: Natural disasters, such as floods or earthquakes, could have played a role in the decline of the Harappa civilization and the dispersal of its people. The region is prone to such events, and a major catastrophe could have disrupted the society and forced its inhabitants to scatter.

- Social or political collapse: It is also possible that internal factors, such as social or political unrest, contributed to the decline of the Harappa civilization. If the society became unstable or faced conflicts, it may have fragmented and its people dispersed.

Overall, the fate of the people of the Harappa civilization remains somewhat of a mystery. While some evidence suggests migration or absorption into other cultures, the exact details are still debated among scholars. The ruins of the Harappan cities, such as Mohenjo-daro and Harappa, continue to be studied, providing valuable insights into the lives and culture of this ancient civilization.