Columbia subject headings:
Christianity and politics--History.
Protestantism--History.
Harvard subject headings:
Christianity and politics--History--19th century.
Christianity and politics--History--20th century
Germany--Church history--19th century.
Germany--Church history--20th century.
Germany--Politics and government--1789-1900
Germany--Politics and government--20th century
Protestant churches--Germany--History--19th century.
Protestant churches--Germany--History--20th century
Princeton subject headings:
Christianity and politics--History.
Protestantism--History.