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1. Indus Valley Civilization

   Linked via "Mortimer Wheeler"

   Environmental Change: Major shifts in river patterns, particularly the drying up of the Ghaggar-Hakra system, and potentially increasingly arid conditions affecting agriculture.
   Tectonic Activity: Earthquakes or localized flooding events that disrupted established infrastructure.
   Invasion Theories: The older theory, famously championed by Mortimer Wheeler, suggested violent conquest by invading Indo-Aryan groups (the Vedic period peoples). This theory is now largely discredited, though some elements persist in less …