The U. S. federal system of government is one in which OA. both the national and state governments derive their power from the people
OB. only the national government derives its power from the people
Oc. only the state governments derive their power from the people
D.
neither the national nor state governments derive their power from the people
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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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during the 20th century, the role of the vice president has evolved into more of an executive branch position. now, the vice president is usually seen as an integral part of a president's administration and presides over the senate only on ceremonial occasions or when a tie-breaking vote may be needed.