At the risk of oversimplifying recent Quaker developments in America, we could consider the 1950s "a decade of rediscovery and redefinition" among Friends. The 1952 World Gathering at Oxford, England, produced a renewed interest in rediscovering the historical roots of Quakerism, and in 1956 the Association of Evangelical Friends adopted a constitution. This was also a time in which several young Quaker scholars began to make contributions that would continue over several decades.
Anderson, Paul, "Probing Questions for a Forward-Looking People" (1987). Faculty Publications - College of Christian Studies. 265.