In its early years, William Penn's "Peaceable Kingdom" was anything but. Pennsylvania's governing institutions were faced with daunting challenges: Native Americans proved far less docile than Penn had hoped, the colony's non-English settlers were loath to accept Quaker authority, and Friends themselves were divided by grievous factional struggles. Yet out of this chaos emerged a colony hailed by contemporary and modern observers alike as the most liberal, tolerant, and harmonious in British America.

In "Friends and Strangers," John Smolenski argues that Pennsylvania's early history can...