Civilizations & empires

12 of them, most widely shared first.

Roman Empire 10 countries Achaemenid Empire 6 countries Inca Empire 5 countries Maya civilization 5 countries Indus Valley civilization 2 countries Qing dynasty 2 countries Sasanian Empire 2 countries Ancient Egypt 1 country Aztec Triple Alliance 1 country Bourbon Restoration in France 1 country German Empire 1 country Sumer 1 country