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Indus Valley Civilization. The Indus Valley Civilization was a vast Bronze Age society that flourished from roughly 3300 BCE to 1300 BCE across modern Pakistan and northwest India. Centered around major rivers, it featured incredibly advanced urban planning with grid like street layouts and complex underground drainage systems. This society matters immensely as one of the three foundational cradles of human civilization in the Old World. They also developed a unique writing system that completely frustrates modern archaeologists because it remains completely undeciphered.
This incredible society reached its peak around 2600 BCE before entering a puzzling period of rapid decline. Historians debate the exact causes, but evidence strongly points to drying local rivers and shifting monsoon patterns that destroyed their agricultural surplus. As food became scarce, massive cities like Harappa were slowly abandoned, and the population dispersed into smaller farming communities. Their cultural practices faded away, though their ideas likely influenced later religious developments in the region.