Which ancient civilization is recognized for its numerous city-states?

The Mayans are recognized for their numerous city-states, which were independent political entities that often engaged in trade, warfare, and alliances with one another. Each city-state typically included a central city with surrounding territories and was governed by its own leader or ruling class. This political structure fostered cultural development, including impressive achievements in writing, astronomy, and mathematics, as well as monumental architecture exemplified by ceremonial centers like Tikal and Calakmul.

While the Incas and Aztecs also had advanced civilizations, they operated under more centralized forms of government, with the Incas managing a vast empire centered around a single ruler, and the Aztecs forming a powerful empire with a capital city. The Mesopotamians were known for their city-states as well, but the question specifically highlights the civilization most prominently recognized for the city-state structure, which aligns more closely with the Mayans.