Answer:
- Herbert Hoover: He expressed shock and sadness, calling it a "dark day in our history."
- Harry S. Truman: Truman was deeply saddened and called the assassination a "terrible tragedy."
- Dwight D. Eisenhower: Eisenhower expressed grief and shock, stating that "all of us share the grief that Mrs. Kennedy must now feel."
- Lyndon B. Johnson: As Kennedy's Vice President, Johnson was sworn in as President immediately after Kennedy's death. He expressed his grief and pledged to continue Kennedy's work.
- Richard Nixon: Nixon, who had run against Kennedy in 1960, expressed shock and sadness at the news.
- Gerald Ford: Ford, who was a member of the Warren Commission that investigated Kennedy's assassination, expressed his condolences to the Kennedy family.
- Jimmy Carter: Carter was not yet in national politics when Kennedy was assassinated, but he has spoken about the profound impact the event had on him and the nation.
- Ronald Reagan: Reagan, who was an actor at the time of Kennedy's death, expressed his shock and grief at the news.
- George H.W. Bush: Bush, who was just beginning his political career, expressed his shock and sadness at Kennedy's death.
- Bill Clinton: Clinton, who met Kennedy as a teenager, has spoken about how Kennedy's death affected him deeply and inspired his own political career.
- George W. Bush: Bush was a teenager when Kennedy was assassinated and has spoken about how the event impacted his view of the world.
- Joe Biden: Biden was a law student when Kennedy was assassinated. He has spoken about how Kennedy's death marked a turning point in American history.
Please note that these are general sentiments and may not reflect the exact words of each President.
Step-by-step explanation: