the limitations of power is 25 years
Yes, because all presidents have the power of chief diplomat and many other powers.
No ex-president has later become a Secretary of State- six have moved up from Secretary of State to president, however.
The position of secretary of state is a cabinet position and is appointed by the President of the United States. Each term is four years and the President could appoint the secretary of State for two terms.
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Historically, there have been a few instances where the U.S. Secretary of State was out of the country during the President's State of the Union address. While exact numbers can vary, notable occurrences include Secretary of State John Kerry in 2014, who was in India, and Secretary of State Hillary Clinton in 2012, who was traveling in Africa. These situations are relatively rare, as the Secretary of State typically attends this significant event.
There were 5:1912 Elihu Root The Secretary of State under Teddy Roosevelt 1929 Frank B Kellog The Secretary of State under Calvin Coolidge 1945 Cordell Hull The Secretary of State under Franklin D Roosevelt 1953 George C Marshall The Secretary of State under Harry S Truman 1973 Henry Kissinger The Secretary of State under Richard Nixon
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they con serve as many as many as they want or as few as they want
John Kerry served as Secretary of State for four years, from February 1, 2013, to January 20, 2017, during the presidency of Barack Obama.
The Secretary of State was William Seward, and the Secretary of the Treasury was Salmon Portland Chase. Both were Republicans and among all of Lincoln's cabinet, Chase was the most radical. As an aside, many Republicans had complained that Seward was more qualified to carry the Republican banner in the 1856 presidential elections. Fremont had received the nod.
4 positions Secretary of State Thomas Jefferson Secretary of War Henry Knox Secretary of the Treasury Alexander Hamilton Attorney General Edmund Randolph
In some states it is the Secretary of State.