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- Presidents✖[remove]12
- Politics and government6
- History5
- Assassination3
- Election3
- Kennedy, John F. (John Fitzgerald), 1917-19632
- Lincoln, Abraham, 1809-18652
- Presidential candidates2
- Presidents' spouses2
- Roosevelt, Eleanor, 1884-19622
- Roosevelt, Franklin D. (Franklin Delano), 1882-19452
- American Civil War1
- Biographical television programs1
- Booth, John Wilkes, 1838-18651
- Bush, George, 1924-20181
- Clinton, Bill, 1946-1
- Clinton, Hillary Rodham1
- Communications, Military1
- Coups d'état1
- Effect of technological innovations on1