Plez help will give Brainliest and give explanation

Big brain

Federalism is a mixed or compound mode of government that combines a general government with regional governments in a single political system. Its distinctive feature, first embodied in the Constitution of the United States of 1789, is a relationship of parity between the two levels of government established.

Explanation:

Your answer would be D or 4th answer

do you have a list of sources to choose from?

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.

hope this .

plz give me brainliest!