Two hundred years ago, on July 4, 1826, Thomas Jefferson and John Adams died within hours of each other. Today, this is usually recalled, when it’s recalled at all, as trivia. But it was far from trivial when it happened. Americans were stunned that the two men most responsible for the Declaration of Independence—Jefferson its author, Adams its chief advocate—died on the same day, and that this day was the Fourth of July, and that this Fourth of July was the 50th anniversary of the Declaration.