jan 1, 2600 BC - Harappan Civilization – (c. 2600 BCE)
Description:
The Indus Valley Civilization reached its peak with cities like Mohenjo-Daro and Harappa. These cities featured grid layouts, advanced drainage, and standardized weights and measures. The Harappans became powerful through urban planning, trade networks, and centralized authority, though their script remains undeciphered.