Северогерманский союз
Prussia created the North German Confederation in 1867 covering all German states north of the river Main and also the Hohenzollern territories in Swabia. Besides Austria, the South German states Bavaria, , , and Hesse- remained separate from the rest of Germany. However, due to the successful prosecution of the Franco-Prussian War, the four southern states joined the North German Confederation by treaty in November 1870.