Lincoln signed Ulysses S. Grant.
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D. The Speaker of the House.
While technically it would be the Vice President, he does not usually spend anytime at the Capitol, so it would be the speaker.
The amendment process was included in order to ensure that the Constitution did not become weak. This prevented any corruption or loopholes in the amendment process, keeping it from becoming something like the Articles of Confederation. Hope this helps and let me know if you have more questions!
