The Kingdom of Prussia (German: Königreich Preußen) was a German kingdom that constituted the state of Prussia between 1701 and 1918.[3] It was the driving force behind the unification of Germany in 1871 and was the leading state of the German Empire until its dissolution in 1918.[3] Although it took its name from the region called Prussia, it was based in the Margraviate of Brandenburg, where its capital was Berlin.
In the Treaty of Stockholm (signed in 1719 and 1720 which ended the war between Sweden and an alliance of Hanover and Prussia). Prussia gained all of Swedish Pomerania east of the river Oder.
One of the major consequences of people migrating from the rural area to the city was that population density rose and living conditions in many cities became very poor.
