- https://en.wikipedia.org/wiki/Kingdom_of_Prussia
- Kingdom of Prussia (Wikipedia)
The Kingdom of Prussia (German: Königreich Preußen, pronounced [ˈkøːnɪkʁaɪç ˈpʁɔʏsn̩]) was a German state that existed from 1701 to 1918. It played a significant role in the unification of Germany in 1871 and was a major constituent of the German Empire until its dissolution in 1918. Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg. Its capital was Berlin.