What are the 6 main civilizations?

The six main civilizations often referenced in historical studies are Mesopotamia, ancient Egypt, the Indus Valley Civilization, Ancient China, the Mesoamerican civilizations (such as the Maya and Aztec), and Ancient Greece. These civilizations are characterized by their advanced social structures, technological innovations, and contributions to culture, governance, and economy. Each played a significant role in shaping human history and laid the foundations for future societies.