Book excerpt: Pennsylvania's role in the development of American culture and society has received an increasing amount of attention in the past two decades, as the tercentenary celebrations of the founding of the province led to a reexamination of the colony and state's contributions to the ethnic and religious diversity of modern America. With increasing pluralism, however, the religious group that was most prominent in the establishment of the province - the Society of Friends, or Quakers - declined in its impact and importance.