Final answer:
Three United States Presidents who have addressed the National Convention are Bill Clinton, Barack Obama, and George Washington.
Step-by-step explanation:
Three United States Presidents who have addressed the National Convention are:
- Bill Clinton: In 1988, Clinton introduced the Democratic nominee Michael Dukakis at the convention, gaining national exposure which helped him in his own presidential campaign later.
- Barack Obama: In 2004, Obama gave the keynote address at the convention, catching the attention of the Democratic establishment and contributing to his rise to national prominence.
- George Washington: He attended the National Convention as a delegate and was subsequently appointed as the commander of the army.