Because it helped the colonies stop being colonies, and it is so important for this moment lived in American history.
His success was such that he was able to build printers in another of the 13 American colonies and amassed a great fortune, which allowed him to retire from business (1752), devoting himself entirely to politics and scientific research. He was a member of the Pennsylvania Assembly (1751-1764). He set up a fire department in Philadelphia, founded the first circulation library in the United States, and an academy that later became the University of Pennsylvania. He organized a reading and discussion club, which gave birth to the American Society of Philosophy, and helped found the state hospital.