Search Oxford Reference Online for reference articles on literary and historical periods as well as on literary authors. This collection includes hundreds of reference works from Oxford University Press, such as Oxford Companion to German Literature
Articles for specific periods:
Germania by Phillip Veit (1848)
The North German Confederation / Norddeutscher Bund (1867–1871) in red. The states that would join the confederation and form the German Empire are in orange., the territory annexed from France following the Franco-Prussian War of 1871, is in a paler orange. Map source.