In the year 1782, The Great Seal of the United States was created as a symbol of the independence of the nation and as an act of being self-government. The symbol has appeared on official documents. And the items that appear there from the options given are stars, arrows, and layers on the pyramid.
Early civilizations depended greatly on agriculture, which means that they depended on water.
What Mesopotamians and Egyptians did (as well as others) was that they built canals from the rivers which would lead water to the crops as an irrigation system more or less.