The correct answer to this open question is the following.
Classical civilizations set the standard in the areas of agriculture, political organization, irrigation, social structire, and architecture.
We are talking about the Greeks or the Romans, that received a great deal of influence of ancient civilizations such as the Sumerians, that settled in the middle of the Tigris and Euphrates Rivers in the Middle East, and developed complex agriculture, irrigation systems, and city-states, or the Egyptian civilization that settled in the banks of the Nile River and developed a complex social structure and agriculture techniques to grow crops.
