Book excerpt: Since colonial days, religious work in American has happened through denominations. At least since the start of the twentieth century, these religious bodies consisted of a fairly tight, intra-denominationally connected system of congregations, regional judicatories, and national offices. This system was the product of more than two centuries of consolidation among Americanbs historic immigrant and indigenous churches. The vast majority of these structures are still in place, retain some semblance of internal coherence, have considerable social and religious significance, and will be with us for the foreseeable future. Nevertheless, the stresses upon them today clearly indicate that they are entering an unsettled period of transition. The purpose of this book is to examine the national structures of eight diverse Protestant denominations as a part of that shift. The frame of this study is the relationship between the theological and organizational nature of national denominational structures as they adapt to the changing situation of the twenty-first century.