Will mark Why did the power of chiefs decline? A Their groups adopted new power structures.
B Their groups wanted European leaders.
C Their groups separated and scattered.
D Their groups overthrew them.
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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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basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.

which statement explains one of the reasons world war 1 was so much more destructive than earlier conflicts