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Ulysses S Grant!

While Ulysses S Grant is best known for his military career, including bringing victory for the Union in the Civil War, Grant was also the eighteenth President. After the war, he was elected President and oversaw Reconstruction in the South. He died of throat cancer — the result of a lifelong habit of cigar smoking — but completed his memoirs before his death in 1885.
Grant was an idealistic leader. During his tenure, Grant supported civil rights for former slaves — at a time when few could conceive of doing so. He worked for ratification of the Fifteenth Amendment, which supported the right of African Americans to vote, and he helped pass the Ku Klux Klan Act of 1871, which allowed the government to fight the Klan more vigorously. Grant, of course, trusted in the use of force when necessary, as befits a former general.