"a. advanced political organization" was not a broad trend from 8000 to 600 BCE, due mostly to the fact that this didn't happen under labor became far more specialized, along with more advanced trade.
A federal system of government exists when power is shared between a central, federal body, and smaller entities such as states. The Founders chose this because they wanted to protect state and individual rights while making sure that the country had a strong central power.
Is there any choices??? It might help for me to answer if there are.. :)