I think it’s a because it flows to the yellow river
The federalist papers make the case for a federal system in the U.S. This would create a strong central government that is checked by state and local governments. The main idea is that people are inherently fractious and no ones faction should gain complete power.
Also, by allowing different layers of government, people are both involved and also there is a balance of power.
Opposed to the federalism, where people who only wanted states to have power and really no central government. This was refuted by the federalist as causing weakness in countries especially in the foreign affairs.
The increased migration and increased population that the United States saw during (any) era are examples of "<span>c. demographic and environmental changes," since these have to do mainly with population distribution. </span>
It gave the greek scientists to meditate and become one with what they are studying.