From Stamps of the World
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Album page for Prussia stamps end 19th c. There were near 30 million inhabitants on 348,000 km².

Prussia was a historic state originating out of the Duchy of Prussia and the Margraviate of Brandenburg, and centered on the region of Prussia.
For centuries, the House of Hohenzollern ruled Prussia, successfully expanding its size by way of an unusually well-organised and effective army. Prussia, with its capital in Königsberg and from 1701 in Berlin, shaped the history of Germany. In 1871, German states united to create the German Empire under Prussian leadership. In November 1918, the monarchies were abolished and the nobility lost its political power during the German Revolution of 1918–19.
The Kingdom of Prussia was thus abolished in favour of a republic—the Free State of Prussia, a state of Germany from 1918 until 1933. From 1933, Prussia lost its independence as a result of the Prussian coup, when the Nazi regime was successfully establishing its "Gleichschaltung" laws in pursuit of a unitary state. With the end of the Nazi regime, the division of Germany into allied-occupation zones and the separation of its territories east of the Oder–Neisse line, which were incorporated into Poland and the Soviet Union, the State of Prussia ceased to exist de facto in 1945. Prussia existed de jure until its formal liquidation by the Allied Control Council Enactment No. 46 of 25 February 1947.

N.B. sub-categories are provided for a route into 6 current countries that had a Prussian influence at some point in their postal history. The Category Kingdom of Prussia postmarks for instance will show postmarks of towns that are currently in a number of country categories but show Prussian usage.