World History
That all appointments made by the President and an treaties signed by him must be ratified by the Senate in U.S.A. indicates

Rule of law
Due process of law
Theory of checks and balances
Theory of separation of powers

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World History
What did the ninth-century Scandinavian invasions do in England?

Led to disintegration of a large kingdom into smaller kingdoms
Gave way to colonization by the Vikings
Brought down Anglo-Saxon alliance
Promoted various small kingdoms to merge into a large kingdom

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