Final answer:
The source of governmental power in the U.S. is the people, with Congress being an example of an institution deriving its power from them.
Explanation:
The source of any and all governmental power in the U.S. is the people. Congress is an example of a body that derives its power from the people, as outlined in the U.S. Constitution where the legislative branch, Article I, is granted key powers by the Constitution.
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