What Happens When a President Becomes Ill or Incapacitated While in Office? - HISTORY
Truman Becomes President of the US upon Roosevelt's Death
Lyon Gardiner Tyler Jr., Grandson of the 10th President, Dies at 95 - The New York Times
US Presidential Line of Succession
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United States presidential line of succession - Wikipedia
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US Presidential Line of Succession
Andrew Johnson | The White House
The forgotten man who almost became President after Lincoln | Constitution Center
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Kamala Harris: The many identities of the first woman vice-president - BBC News
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How F.D.R.'s Death Changed the Vice-Presidency | The New Yorker
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Often cited during Trump presidency, 25th Amendment reemerges with president's coronavirus diagnosis - The Boston Globe
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Presidential and VP Succession Fast Facts | CNN Politics
Analyzing how 3 U.S. presidents announced the deaths of terrorist leaders : NPR
Fact check: If VP becomes president, House speaker doesn't move to VP
Presidential succession explained: Who becomes Vice President if the President dies and what if neither can serve? | The US Sun
Richard M. Nixon | The White House
