Final answer:
The method that has never been used to amend the U.S. Constitution involves states initiating new amendments through a constitutional convention, as per Article V.
Explanation:
The method that has never been used to amend the U.S. Constitution is when states initiate new amendments by holding a constitutional convention. This process, outlined in Article V of the Constitution, has never been utilized to date due to concerns about the potential implications of reopening the entire Constitution for revision.
Learn more about U.S. Constitution Amendment Processes here:
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