Truman was president because FDR had died he took the office as Vice President.
General U. S. Grant
James Buchanan was the 15th President of the U. S.
Vice President Harry S Truman became U. S. President when Franklin D. Roosevelt died, near the end of World War II, April, 1945.
U. S. Senate
9th U. S. President William Henry Harrison was the grandfather of 23rd U. S. President Benjamin Harrison.
Martin Van Buren: N. Y. Attorney General : 1815-1819 U. S. Senator : 1821-1828 N. Y. Governor : 1829 U. S. Secretary of State : 1829-1831 U. S. Minister to the U. K. : 1831-1832 U. S. Vice President : 1833-1837 U. S. President : 1837-1841
Andrew Johnson was President from the death of Lincoln in April, 1865 until the end of his term on March 4, 1869 when U. S. Grant became President.
Most of us have never been a U. S. President. In fact, it's quite possible that no U. S. President has ever visited WikiAnswers.
U. S. Vice President
If no Vice Presidential appointment has been confirmed by Congress before the second individual resigns, the presidency goes to the holder of the office that is highest on the list below who is qualified, willing and able to perform the duties of the presidency.The Speaker of the U. S. House of RepresentativesThe President Pro Tempore of the U. S. SenateThe U. S. Secretary of StateThe U. S. Secretary of the TreasuryThe U. S. Secretary of DefenseThe U. S. Attorney GeneralThe U. S. Secretary of the InteriorThe U. S. Secretary of AgricultureThe U. S. Secretary of CommerceThe U. S. Secretary of LaborThe U. S. Secretary of Health and Human ServicesThe U. S. Secretary of EducationThe U. S. Secretary of Housing and Urban DevelopmentThe U. S. Secretary of TransportationThe U. S. Secretary of EnergyThe U. S. Secretary of Veterans AffairsThe U. S. Secretary of Homeland Security
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The parts of the U. S. Constitution that have to do with the election of the president are Article 2, Section 1, Clauses 2 through 5 and the 12th and 22nd Amendments.