Final answer:
The Twenty-fifth Amendment outlines the succession of power in the Presidency and clarifies the role of the Vice President.
Step-by-step explanation:
The Twenty-fifth Amendment affects the Presidency by providing a clear procedure for the succession of power in case the President dies, resigns, or is unable to discharge the duties of the office. It establishes that the Vice President shall become President in such cases, and also lays out the process to fill a vacancy in the Vice Presidency. This amendment has been invoked several times in history, such as when Gerald Ford became President after Richard Nixon's resignation, and when George H.W. Bush became President after Ronald Reagan's term.
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