23. Which president's assassination caused the ratification of the 25th Amendment?*1 pointJohn F. KennedyLyndon B. JohnsonAbraham LincolnWilliam McKinley

The assassination of President John F. Kennedy led to the ratification of the 25th Amendment. Here are the steps that explain this:

1. John F. Kennedy was assassinated on November 22, 1963, in Dallas, Texas. Vice President Lyndon B. Johnson was sworn in as President on the same day.

2. The succession of Johnson to the presidency raised questions about the constitutional provisions for presidential succession and disability. The Constitution was not clear on these issues.

3. This led to the proposal of the 25th Amendment to the Constitution. The amendment clarified the procedures for presidential succession and disability.

4. The 25th Amendment was proposed by Congress on July 6, 1965.

5. It was ratified by the necessary number of states on February 10, 1967.

So, the assassination of President John F. Kennedy was the event that caused the ratification of the 25th Amendment.