Presidential succession refers to the procedure for replacing the president (or vice president) in the event of death or some other form of removal. The Constitution (text) (Article II, Section 1, Clause 6) stipulates that the Vice President is to replace the President, but grants to Congress the power to determine further succession.
A Presidential Succession Act of 1792 provided that after the Vice president, the next officials in line would be the President Pro Tempore (presiding officer) of the Senate and the Speaker of the House of Representatives.
The contest for dominance was complicated by the emergence of a newly empowered force in the 1880s the American businessman. In this age, the Rockefellers and Carnegies were regarded by many as the elite. They were seen as superior to mere politicians who supped at the public trough. Businessmen, however, had to struggle and use their wits to survive an affirmation of what was called "Social Darwinism."
This reverence for executives played a part in the passage of the Presidential Succession Act of 1886, which dropped the politicians (President Pro tempore and Speaker) from the line of succession and installed the Cabinet secretaries in the order in which their departments were created.
Following World War II, a new Presidential Succession Act of 1947 was passed, which placed the Speaker of the House and the President Pro Tempore of the Senate behind the Vice President. The line of succession then extended to the executive department heads in the order in which their agencies were created.
No constitutional (narrative) provision existed for filling a vice presidential vacancy until the ratification of the 25th Amendment in 1967.
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Presidential Succession So, whenever the structure of the Cabinet changes, the Presidential Succession Act must be amended to reflect the changes. Since the law was first enacted in 1947, for example, the Secretary of War has been replaced by tPresidential Succession Act must be amended to reflect the changes. Since the law was first enacted in 1947, for example, the Secretary of War has been replaced by the Secretary of Defense ... http://www.doctorzebra.com/prez/a_succession.htm