Who are the vice president in order of succession to the presidency?

The U.S. Constitution has provided for the filling of mid-term vacancies in the U.S. Vice Presidency only since 1967. Since then only two people have become Vice President by appointment: Gerald R. Ford, whose nomination by President Nixon was confirmed by Congress on December 6, 1973, and Nelson A. Rockefeller, whose nomination by President Ford was confirmed on December 19, 1974.