American consumption, although it leads to many things both "good" and "bad" tends to "deplete many natural resources". It also tends to have negative effects on the environment.
The power of the Executive Branch is vested in the President of the United States, who also acts as head of state and Commander-in-Chief of the armed forces.
What first comes to my mind is that one or more rivers feature very prominently in these civilizations: the Nile in the Egyptian and the Tigris and Euphrates in the Babylonian.
