July 4, 1826 is a unique date, to be sure! If you are an American, just "July 4" in itself is significant. But then add "1826".
Two former presidents died within hours of each other on Independence Day, July 4, 1826. That was fifty years after they were both influential in getting the Declaration of Independence approved.
Learn more about the relationship between John Adams and Thomas Jefferson and the incredible timing of both their deaths! Independence Day and the Deaths of Two Presidents