Free State of Prussia in the context of Allied Control Council

The Province of Pomerania (German: Provinz Pommern; Polish: Prowincja Pomorze) was a province of Prussia from 1815 to 1945. Pomerania was established as a province of the Kingdom of Prussia in 1815, an expansion of the older Brandenburg-Prussia province of Pomerania, and then became part of the German Empire in 1871. From 1918, Pomerania was a province of the Free State of Prussia until it was dissolved following World War II by decree of the Allied Control Council with the de jure abolition of Prussia on 25 February 1947, and its territory divided between Poland and Allied-occupied Germany. The city of Stettin (present-day Szczecin, Poland) was the provincial capital.

The Neumark (German pronunciation: [ˈnɔʏmaʁk] ), also known as the New March (Polish: Nowa Marchia) or as East Brandenburg (German: Ostbrandenburg [ˈɔstˌbʁandn̩bʊʁk] ), was a region of the Margraviate of Brandenburg and its successors located east of the Oder River in territory which became part of Poland in 1945 except some villages of former districts of Königsberg in the New March and Weststenberg remained in Germany.

Called the Lubusz Land while part of medieval Poland, the territory later known as the Neumark gradually became part of the German Margraviate of Brandenburg from the mid-13th century. As Brandenburg-Küstrin the Neumark formed an independent state of the Holy Roman Empire from 1535 to 1571; after the death of the margrave John, a younger son of Joachim I Nestor, Elector of Brandenburg, it returned to Elector John George, the margrave's nephew and Joachim I Nestor's grandson. With the rest of the Electorate of Brandenburg, it became part of the Kingdom of Prussia in 1701 and part of the German Empire in 1871 when each of those states first formed. After World War I the entirely ethnic German Neumark remained within the Free State of Prussia, itself part of the Weimar Republic (Germany).

East Prussia (German: Ostpreußen [ˈɔstˌpʁɔɪ̯sn̩] ) was a province of the Kingdom of Prussia from 1772 to 1829 and again from 1878 (with the Kingdom itself being part of the German Empire from 1871); following World War I it formed part of the Weimar Republic's Free State of Prussia, until 1945. Its capital city was Königsberg (present-day Kaliningrad). East Prussia was the main part of the region of Prussia along the southeastern Baltic Coast.

The bulk of the ancestral lands of the Baltic Old Prussians were enclosed within the later province of East Prussia. During the 13th century, the native Prussians were conquered by the crusading Teutonic Knights. After the conquest they were gradually converted to Christianity. As a result of the medieval Ostsiedlung, Germans became the dominant ethnic group, while Poles and Lithuanians formed sizeable minorities. From the 13th century, the region of Prussia was part of the monastic state of the Teutonic Knights. After the Second Peace of Thorn in 1466 it became a part of the Kingdom of Poland, either directly (Warmia) or as a fief (remainder). In 1525, with the Prussian Homage, the territory became the Duchy of Prussia, a vassal duchy of Poland. It gained full sovereignty in 1657, when Poland renounced its feudal rights in the Treaty of Bromberg.

The Geheime Staatspolizei ([ɡəˈhaɪmə ˈʃtaːtspoliˌtsaɪ] , lit. 'Secret State Police'), abbreviated Gestapo ([ɡəˈstaːpo] ), was the official secret police of Nazi Germany and in German-occupied Europe.

The force was created by Hermann Göring in 1933 by combining the various political police agencies of Prussia into one organisation. On 20 April 1934, oversight of the Gestapo passed to the head of the Schutzstaffel (SS), Heinrich Himmler, who was also appointed Chief of German Police by Hitler in 1936. Instead of being exclusively a Prussian state agency, the Gestapo became a national one as a sub-office of the Sicherheitspolizei (SiPo; Security Police). From 27 September 1939, it was administered by the Reich Security Main Office (RSHA). It became known as Amt (Dept) 4 of the RSHA and was considered a sister organisation to the Sicherheitsdienst (SD; Security Service).

The Rhine Province (German: Rheinprovinz), also known as Rhenish Prussia (Rheinpreußen) or synonymous with the Rhineland (Rheinland), was the westernmost province of the Kingdom of Prussia and the Free State of Prussia, within the German Reich, from 1822 to 1946. It was created from the provinces of the Lower Rhine and Jülich-Cleves-Berg. Its capital was Koblenz, with the provincial assembly meeting in Düsseldorf. In 1939 it had 8 million inhabitants. The Province of Hohenzollern was militarily associated with the Oberpräsident of the Rhine Province. Also, for a short period of time, the Province of Hohenzollern was indirectly and de facto controlled by the Rhine Province.

The Rhine Province was bounded on the north by the Netherlands, on the east by the Prussian provinces of Westphalia and Hesse-Nassau, and the grand duchy of Hesse-Darmstadt, on the southeast by the Palatinate (a district of the Kingdom of Bavaria), on the south and southwest by Lorraine, and on the west by Luxembourg, Belgium and the Netherlands.

The Province of Nassau (German: Provinz Nassau) was a province of Prussia from 1944 to 1945.

Although all German states (including Prussia) had been de facto dissolved since 1933, the Nazi government formally partitioned the Prussian province of Hesse-Nassau into two provinces with a decree issued on 1 April 1944 and effective on 1 July 1944. The two new provinces were the province of Kurhessen and the province of Nassau.

Westphalia (/wɛstˈfeɪliə/; German: Westfalen [vɛstˈfaːlən]; Low German: Westfålen [vεs(t)ˈfɔːln]) is a region of northwestern Germany and one of the three historic parts of the state of North Rhine-Westphalia. It has an area of 20,210 square kilometres (7,800 sq mi) and 7.9 million inhabitants.

The territory of the region is almost identical with the historic Province of Westphalia, which was a part of the Kingdom of Prussia from 1815 to 1918 and the Free State of Prussia from 1918 to 1946. In 1946, Westphalia merged with North Rhine, another former part of Prussia, to form the newly created state of North Rhine-Westphalia. In 1947, the state with its two historic parts was joined by a third one: Lippe, a former principality and free state.

The Prussian State Council (German: Preußischer Staatsrat) was the second chamber of the bicameral legislature of the Free State of Prussia between 1921 and 1933; the first chamber was the Prussian Landtag (Preußischer Landtag). The members of the State Council were elected by the provincial parliaments and gave the provinces of Prussia a voice in the legislative process. The Council had an indirect right to introduce legislation, could object to bills passed by the Reichstag and had to approve expenditures that exceeded the budget.

Hanover (/ˈhænoʊvər, -nəv-/ HAN-oh-vər, HAN-ə-vər; German: Hannover [haˈnoːfɐ] ; Low German: Hannober) is the capital and largest city of the German state of Lower Saxony. Its population of 535,932 (2021) makes it the 13th-largest city in Germany as well as the fourth-largest in northern Germany after Berlin, Hamburg and Bremen. Hanover's urban area comprises the towns of Garbsen, Langenhagen and Laatzen and has a population of about 791,000 (2018). The Hanover Region has approximately 1.16 million inhabitants (2019) and is the largest in the Hanover–Braunschweig–Göttingen–Wolfsburg Metropolitan Region, the 17th biggest metropolitan area by GDP in the European Union.

Before it became the capital of Lower Saxony in 1946, Hanover was the capital of the Principality of Calenberg (1636–1692), the Electorate of Hanover (1692–1814), the Kingdom of Hanover (1814–1866), the Province of Hanover of the Kingdom of Prussia (1868–1918), the Province of Hanover of the Free State of Prussia (1918–1947) and of the State of Hanover (1946). From 1714 to 1837 Hanover was by personal union the family seat of the Hanoverian Kings of the United Kingdom of Great Britain and Ireland, under their title of the dukes of Brunswick-Lüneburg (later described as the Elector of Hanover).

The Province of Hesse-Nassau (German: Provinz Hessen-Nassau) was a province of the Kingdom of Prussia from 1868 to 1918, then a province of the Free State of Prussia until 1944.

Hesse-Nassau was created as a consequence of the Austro-Prussian War of 1866 by combining the previously independent Hesse-Kassel (or Hesse-Cassel), the Duchy of Nassau, the Free City of Frankfurt, areas gained from the Kingdom of Bavaria, and areas gained from the Grand Duchy of Hesse (including part of the former Landgraviate of Hesse-Homburg from Hesse-Darmstadt). These regions were combined to form the province Hesse-Nassau in 1868 with its capital in Kassel and redivided into two administrative regions: Kassel and Wiesbaden. The largest part of the province surrounded the province of Upper Hesse in the Grand Duchy of Hesse (People's State of Hesse from 1918).

Saxony-Anhalt (/ ... ˈɑːnhɑːlt/ ... AHN-hahlt; German: Sachsen-Anhalt [ˌzaksn̩ ˈʔanhalt] ; Low German: Sassen-Anholt) is a state of Germany, bordering the states of Brandenburg, Saxony, Thuringia and Lower Saxony. It covers an area of 20,000 square kilometres (7,700 sq mi)and has a population of 2.17 million inhabitants, making it the 8th-largest state in Germany by area and the 11th-largest by population. Its capital and most populous city is Magdeburg.

The state of Saxony-Anhalt was formed in July 1945 after World War II, when the Soviet army administration in Allied-occupied Germany formed it from the former Prussian Province of Saxony and the Free State of Anhalt. Saxony-Anhalt became part of the German Democratic Republic in 1949, but was dissolved in 1952 during administrative reforms and its territory was divided into the districts of Halle and Magdeburg. Following German reunification, the state of Saxony-Anhalt was re-established in 1990 and became one of the new states of the Federal Republic of Germany.

The 1932 Prussian coup d'état or Preußenschlag (German pronunciation: [ˈpʁɔʏsənˌʃlaːk]; lit. 'Prussian hit') took place on 20 July 1932, when Reich President Paul von Hindenburg, at the request of Franz von Papen, then Reich Chancellor of Germany, replaced the legal government of the Free State of Prussia with von Papen as Reich Commissioner. A second decree the same day transferred executive power in Prussia to the Reich Minister of the Armed Forces Kurt von Schleicher and restricted fundamental rights.

Papen had two rationales for the coup. One was that the 1932 Prussian state election had left a divided parliament with no viable possibilities for a coalition. This led to a caretaker government under the coalition that had held power before the election, with no clear path to replacing it with a new governing coalition. The second and major rationale was that in parts of Prussia there were violent street demonstrations and clashes taking place that Papen said the caretaker government could not control.

The Landtag of Prussia (German: Preußischer Landtag) was the representative assembly of the Kingdom of Prussia implemented in 1849, a bicameral legislature consisting of the upper House of Lords (Herrenhaus) and the lower House of Representatives (Abgeordnetenhaus). After World War I and the German Revolution of 1918–19 the Landtag diet continued as the parliament of the Free State of Prussia between 1921 and 1934, when it was abolished by the Nazi regime.

The Provinces of Prussia (German: Provinzen Preußens) were the main administrative divisions of Prussia from 1815 to 1946. Prussia's province system was introduced in the Stein-Hardenberg Reforms in 1815, and were mostly organized from duchies and historical regions. Provinces were divided into several Regierungsbezirke, sub-divided into Kreise (districts), and then into Gemeinden (townships) at the lowest level. Provinces constituted the highest level of administration in the Kingdom of Prussia and Free State of Prussia until 1933, when Nazi Germany established de facto direct rule over provincial politics, and were formally abolished in 1946 following World War II. The Prussian provinces became the basis for many federal states of Germany, and the states of Brandenburg, Lower Saxony, and Schleswig-Holstein are direct successors of provinces.

The Province of West Prussia (German: Provinz Westpreußen; Kashubian: Zôpadné Prësë; Polish: Prusy Zachodnie) was a province of Prussia from 1773 to 1829 and from 1878 to 1919. West Prussia was established as a province of the Kingdom of Prussia in 1773, formed from Royal Prussia of the Polish–Lithuanian Commonwealth annexed in the First Partition of Poland. West Prussia was dissolved in 1829 and merged with East Prussia to form the Province of Prussia, but was re-established in 1878 when the merger was reversed and became part of the German Empire. From 1918, West Prussia was a province of the Free State of Prussia within Weimar Germany, losing most of its territory to the Second Polish Republic and the Free City of Danzig in the Treaty of Versailles. West Prussia was dissolved in 1919, and its remaining western territory was merged with Posen to form Posen-West Prussia, and its eastern territory merged with East Prussia as the Region of West Prussia district.

West Prussia's provincial capital alternated between Marienwerder (present-day Kwidzyn, Poland) and Danzig (Gdańsk, Poland) during its early existence. West Prussia was notable for its ethnic and religious diversity due to immigration and cultural changes, with the population becoming mixed over the centuries. Since the early Middle Ages the bulk of the region was inhabited by West Slavic Lechitic tribes (Pomeranians in the Pomerelia region and Masovians in Kulmerland), while the actual Old Prussians (Pomesanians and Pogesanians) populated only the remaining part of the territory lying to the east of the Vistula River. The Teutonic Order's conquest of the region resulted in German colonization in the 14th century. As a result of Germanisation, Germans became in the middle of the 19th century the most numerous ethnic group in West Prussia as a whole, remaining as such until the dissolution of the province in 1920, though their distribution was uneven: their majority was concentrated in Danzig, the western lands of the province, along the Vistula river, and in the Pomesanian and Pogesanian portion of the province located east of the Vistula, with a small admixture of Poles (Gedanians and Powiślans). Meanwhile, Poles (Kociewians, Borowians and Chełminians) as well as Kashubians continued to predominate in parts of Pomerelian territories west of Vistula and in parts of the Chełmno Land, forming altogether around 36% of the population of the province as a whole. There were also sizeable minorities of Mennonites and Jews settling in the region.

The Province of Posen (German: Provinz Posen; Polish: Prowincja Poznańska) was a province of the Kingdom of Prussia from 1848 to 1920, occupying most of the historical Greater Poland. The province was established following the Poznań Uprising of 1848 as a successor to the Grand Duchy of Posen, which in turn was annexed by Prussia in 1815 from Duchy of Warsaw. It became part of the German Empire in 1871. After World War I, Posen was briefly part of the Free State of Prussia within Weimar Germany, but was dissolved in 1920 after the Greater Poland Uprising broke out and most of its territory was incorporated into the Second Polish Republic. The remaining German territory was re-organized into Posen-West Prussia in 1922.

Posen (present-day Poznań, Poland) was the provincial capital.

The Province of Brandenburg (German: Provinz Brandenburg) was a province of Prussia from 1815 to 1947. Brandenburg was established in 1815 from the Kingdom of Prussia's core territory, comprised the bulk of the historic Margraviate of Brandenburg (excluding Altmark) and the Lower Lusatia region, and became part of the German Empire in 1871. From 1918, Brandenburg was a province of the Free State of Prussia until Prussia was dissolved in 1945 after World War II, and replaced with reduced territory as the State of Brandenburg in East Germany, which was later dissolved in 1952. Following the reunification of Germany in 1990, Brandenburg was re-established as a federal state of Germany, becoming one of the new states.

Brandenburg's provincial capital alternated between Potsdam, Berlin, and Charlottenburg during its existence.

The Province of Silesia (German: Provinz Schlesien; Polish: Prowincja Śląska; Silesian: Prowincyjŏ Ślōnskŏ) was a province of Prussia from 1815 to 1919. The Silesia region was part of the Prussian realm since 1742 and established as an official province in 1815, then became part of the German Empire in 1871. In 1919, as part of the Free State of Prussia within Weimar Germany, Silesia was divided into the provinces of Upper Silesia and Lower Silesia. Silesia was reunified briefly from 1 April 1938 to 27 January 1941 as a province of Nazi Germany before being divided back into Upper Silesia and Lower Silesia.

Breslau (present-day Wrocław, Poland) was the provincial capital.