Why was Thomas Jefferson so unique as a president?

Jefferson is best known for his role in writing the Declaration of Independence, his foreign service, his two terms as president, and his omnipresent face on the modern nickel. The well-rounded Jefferson was also a Renaissance man who was intellectually curious about many things.

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the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.