网页e. The Kingdom of Prussia[a] (German: Königreich Preußen, pronounced [ˈkøːnɪkʁaɪç ˈpʁɔʏsn̩] ⓘ) constituted the German state of Prussia between 1701 and 1918. [5] It was the driving force behind the unification of Germany in 1866 and was the leading state of the German Empire until its dissolution in 1918. [5]