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Step-by-step explanation:
The first law was the presidential succession act of 1792 which states that Article II, Section 1, Clause 6 of the Constitution authorizes Congress to declare who should lead as president if both the president and the vice president died or are unable to complete there terms. The law state that the president pro tempore of the Senate should succeed as acting president. The bill became law on March 1, 1792, with the signature of President George Washington.
The second presidential succession act of 1886
State that if there is anything wrong with the president or the vice president that won't allow both to be in office, the secretary of state should act as the president until the president is fit to come back or with another election,a new president will emerge, it became law on January 19, 1886, with President Cleveland's signature.
The presidential succession of 1947 happen when Harry S. Truman sent a message to Congress urging the revision of the Presidential Succession Act of 1886. He recommended that the speaker of the House and president pro tempore of the Senate be restored to and given priority in the presidential line of succession over members of the Cabinet. The arrangement was first not accepted but later was accepted by both house of Congress.President Truman signed the bill into law on July 18.