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Prior to ratification of the Twenty-fifth Amendment to the United States Constitution in 1967, there was no provision for filling a vacancy in the Vice Presidency. Richard Nixon was the first president to fill such a vacancy under the provisions of the Twenty-fifth Amendment when he appointed Gerald Ford. Ford later became the second president to fill a vice presidential vacancy when he appointed Nelson Rockefeller to succeed him.
Being the first vice president to assume the presidency, Tyler set a precedent that a vice president who assumes the office of president becomes a fully functioning president who has his own presidency, as opposed to just a caretaker president. His political opponents attempted to refer to him as "Acting President", but he refused to allow that. The Twenty-fifth Amendment to the United States Constitution put Tyler's precedent into the Constitution.
Andrew Johnson did not identify with the two main parties while president and tried and failed to build a party of loyalists under the National Union label. His failure to build a true National Union Party left Johnson without a party.
This term was shortened by 43 days due to the Twentieth Amendment to the United States Constitution going into effect, moving inauguration day from March 4 to January 20.
Dwight Eisenhower is the first president to have been legally prohibited by the Twenty-second Amendment to the United States Constitution from seeking a third term.