Margraviate of Brandenburg replaced by Province of Brandenburg
Kingdom of Prussia
In return for aiding Emperor Leopold I during the War of the Spanish Succession, Frederick William's son, Frederick III, was allowed to elevate Prussia to the status of a kingdom.  On 18 January 1701, Frederick crowned himself Frederick I, King in Prussia. Prussia, unlike Brandenburg, lay outside the Holy Roman Empire, within which only the emperor and the ruler of Bohemia could call themselves king. As king was a more prestigious title than prince-elector, the territories of the Hohenzollerns became known as the Kingdom of Prussia, although their power base remained in Brandenburg.  Legally, Brandenburg was still part of the Holy Roman Empire, ruled by the Hohenzollerns in personal union with the Prussian kingdom over which they were fully sovereign.  For this reason, the Hohenzollerns continued to use the additional title of Elector of Brandenburg for the remainder of the empire's run.  However, by this time the emperor's authority over the empire had become merely nominal.  The various territories of the empire acted more or less as de facto sovereign states, and only acknowledged the emperor's overlordship over them in a formal way. Thus, Brandenburg came to be treated as de facto part of the Prussian kingdom rather than a separate entity.
From 1701 to 1946, Brandenburg's history was largely that of the state of Prussia, which established itself as a major power in Europe during the 18th century. King Frederick William I of Prussia, the "Soldier-King", modernized the Prussian Army, while his son Frederick the Great achieved glory and infamy with the Silesian Wars and Partitions of Poland. The feudal designation of the Margraviate of Brandenburg ended with the dissolution of the Holy Roman Empire in 1806, which made the Hohenzollerns de jure as well as de facto sovereigns over it. It was replaced with the Province of Brandenburg in 1815 following the Napoleonic Wars. The Prussian kings, however, continued to use the title "Margrave of Brandenburg" in their formal style.
Brandenburg, along with the rest of Prussia, became part of the German Empire in 1871 during the Prussian-led unification of Germany.
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