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Why did many European intellectuals admire the U. S. Revolution and its
Constitution and Bill of Rights?

Because the colonies' ideas originally came from the ideals of the natural rights that was proposed in the Enlightenment.

Explanation:

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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the answer to your question is a because laws act as guidelines as to what is accepted in society. without it there would be conflicts between social groups and communities. it serves as a norm of conduct for citizens.