Word that refers to the sequence of who will become president

The word that refers to the sequence of who will become president is succession or presidential succession.

Explanation:

The line of succession is the official order of who shall become president if for some reason the president becomes too ill to fulfill his office, or if he dies, or if he is removed from office by a process like an impeachment. It is the vice president who first will fill the role of president, followed by the speaker of the House of Representatives. Then next in the line of succession is the president pro tempore of the Senate, and then after that, it is the eligible heads of federal executive departments who may step in and act as president should all the others in the line of succession be unable to perform the post. The secretary of state is first and then the others follow based on the date the departments were created.  

We are required to find a word that refers to the sequence of who will become president.

The word that refers to the sequence of who will become president is called presidential succession.

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