Indus Valley Civilization Declines

The Indus Valley Civilization, which had been thriving with planned cities like Mohenjo-daro and Harappa since ~2600 BCE, went into decline around 1900-1700 BCE. These people had grid-planned streets, standardized weights, and the most advanced urban sanitation system in the ancient world. But climate change shifted the monsoon patterns, rivers dried up, and people gradually dispersed. No invasion, no catastrophe — just a slow, sad fade. Sometimes that hits harder than a dramatic end.