If the president can no longer serve, the vice president becomes the president. This has occurred nine times in American history. For example, on November 22, 1963, President John F. Kennedy was shot in Dallas, Texas. Ninety-nine minutes after President Kennedy's death, Vice President Lyndon Johnson was sworn in as president. If the president can no longer serve, the vice president becomes the president.
Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.