
Prussia and Austria have both experienced significant territorial changes over the centuries. Prussia, which is often associated with the German Hohenzollern dynasty, has a complex history of territorial expansion and contraction, with researchers facing challenges due to the dynamic nature of its geography and jurisdiction. On the other hand, Austria's territorial changes encompass the Holy Roman Empire, the Austrian Empire, and the Republic of Austria, with lands added and lost over time, including provinces now part of Italy, Croatia, Slovenia, and Czechia. Both nations have played pivotal roles in European history, with Prussia's expansion contributing to German unification and Austria's involvement in the Napoleonic Wars and the rise of Nazi Germany.
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What You'll Learn
- Prussia annexes four Austrian allies, excluding Austria from German affairs
- Prussia gains territory along the Rhine, connecting all Prussian possessions
- Austria avoids ceding Adriatic realm to Italy, considered an inferior power
- Prussia annexes Schleswig and Holstein, forming the Prussian province
- Austria gains Venice and northern Italy, Prussia gains Saxony and Silesia

Prussia annexes four Austrian allies, excluding Austria from German affairs
The rivalry between Prussia and Austria over dominance in the German states came to a head in 1866 during the Austro-Prussian War. Prussia's victory resulted in the Prussian annexation of four of Austria's former allies and the permanent exclusion of Austria from German affairs.
The Prussian railway system was more advanced than Austria's, allowing Prussia to move troops more efficiently. Prussia's victory in the war shifted the balance of power among the German states, away from Austrian dominance and towards Prussia. This resulted in the abolition of the German Confederation and its partial replacement by the unification of all the northern German states in the North German Confederation, which excluded Austria and the other southern German states.
The war was sparked by a dispute between Prussia and Austria over the administration of Schleswig and Holstein, which they had conquered from Denmark and agreed to jointly occupy at the end of the Second Schleswig War in 1864. Prussia was interested in gaining an alliance with Austria to defeat Denmark and settle the issue of the duchies. However, the Austrian alliance was also seen as aiding Prussian expansion and ultimately leading to war with Austria. Bismarck, in particular, was seen as a Prussian expansionist who sought the unification of Germany under Prussian rule.
The Peace of Prague on 23 August 1866 marked the dissolution of the German Confederation and the formal exclusion of Austria from German affairs. Prussia also annexed Nassau, Hesse-Kassel, and Frankfurt, combining them with the territory surrendered by Hesse-Darmstadt to form the new Province of Hesse-Nassau. The Kingdom of Italy participated in the war on the side of Prussia, which furthered the process of Italian unification. As a result, Italy obtained the Austrian realm of Venetia, marking the only case of a country gaining fully owned Austrian territory from the conflict.
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Prussia gains territory along the Rhine, connecting all Prussian possessions
Prussia's territorial gains along the Rhine were a result of the Congress of Vienna, which took place after the defeat of Napoleon in 1812. The Congress of Vienna aimed to restore the monarchies that Napoleon had overthrown and to resize the main powers to preserve peace. As a result, France lost all its recent conquests, while Prussia, Austria, and Russia made significant territorial gains.
Prussia was rewarded for its role in the defeat of Napoleon with the acquisition of new territories, including parts of the Kingdom of Saxony, Westphalia, and the northern Rhineland. The consolidation of Germany from nearly 300 states into 39 states was confirmed, with these states forming a loose German Confederation under the leadership of Austria and Prussia. The Congress also recognised the independence of Switzerland and the formation of the United Kingdom of the Netherlands, which included formerly Austrian-ruled territories.
Prussia's gains along the Rhine connected its possessions in the Rhineland and Westphalia with the rest of the kingdom for the first time. This expansion of Prussian territory stretched uninterruptedly from the Niemen in the east to the Elbe in the west. The Prussian provinces of Jülich-Cleves-Berg and the Lower Rhine were later merged in 1822 to form the Rhine Province.
The acquisition of territories along the Rhine was not the only territorial change Prussia underwent during this period. After the 1866 Austro-Prussian War, Prussia annexed four of Austria's allies: the Kingdom of Hanover, the Electorate of Hesse, the Duchy of Nassau, and the Free City of Frankfurt. Prussia also effectively annexed other territories, such as Schleswig and Holstein, and Saxe-Lauenburg, which became a full union with Prussia in 1876. These territorial changes furthered Prussia's dominance and contributed to the exclusion of Austria from German affairs.
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Austria avoids ceding Adriatic realm to Italy, considered an inferior power
The Austrian Empire was a multinational European great power from 1804 to 1867, created by proclamation out of the realms of the Habsburgs. During its existence, it was the third most populous monarchy in Europe. The empire was proclaimed by Francis II in 1804 in response to Napoleon's declaration of the First French Empire.
The Austro-Prussian War, fought in 1866, was a significant conflict between the Austrian Empire and the Kingdom of Prussia, resulting in Prussian dominance over the German states. Prussia's more developed railway system played a crucial role in its victory, allowing for the rapid movement and concentration of troops. The war led to several territorial changes, including the dissolution of the German Confederation and the formation of the North German Confederation, excluding Austria.
One notable territorial change during this period was Austria's ability to avoid directly ceding its Adriatic realm to the Kingdom of Italy as part of the Peace of Prague on 23 August 1866. Austria considered Italy an inferior power and sought to influence Napoleon III in its favour during the crisis with Prussia. Instead, Italy obtained Venetia through the Treaty of Vienna on 3 October 1866, with an agreed plebiscite showing 99.99% in favour of joining Italy. This was the only fully owned Austrian territory gained by Italy from the conflict.
The Austro-Prussian War was part of the longstanding rivalry between Austria and Prussia, which included the Silesian Wars fought over Austrian-controlled Silesia. Prussia ultimately gained most of Silesia, marking a significant loss for Austria. The Prussian victory in the War of Austrian Succession in 1742 resulted in their seizure of the province of Silesia.
The Napoleonic Wars and the subsequent Congress of Vienna also led to territorial changes for Austria. While Napoleon's conquests were reversed, Austria gained Venice and much of northern Italy during this period. The Congress of Vienna, led by Austrian Prime Minister Metternich, aimed to preserve peace and resize the main powers to balance each other.
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Prussia annexes Schleswig and Holstein, forming the Prussian province
Prussia's annexation of Schleswig and Holstein was a significant territorial change that shaped the Prussian province during the 19th and early 20th centuries. This annexation was a result of the Second War of Schleswig in 1864, where Prussia and the Austrian Empire conquered these duchies from Denmark. However, the creation of the Prussian province of Schleswig-Holstein occurred after the Austro-Prussian War in 1866, which ended in Austria's defeat.
On January 12, 1867, by decree of William I, Schleswig and Holstein were officially annexed into the Kingdom of Prussia. This annexation was a strategic move by Prussia to expand its influence and connect its possessions in the Rhineland and Westphalia geographically. The formation of the Prussian province of Schleswig-Holstein took place in 1868, and it incorporated the Duchy of Lauenburg from 1876 onwards.
The province of Schleswig-Holstein played a pivotal role in Prussia's unification efforts. It served as a crucial link between the Prussian territories, stretching uninterruptedly across the northern two-thirds of Germany. This province was one of the three new provinces established by Prussia after the Austro-Prussian War, alongside Hanover and Hesse-Nassau. The creation of these provinces marked a shift from the aspirations of a grand unified state of all German-speaking states to the formation of the North German Confederation under Prussian leadership.
The province of Schleswig-Holstein underwent several changes in the early 20th century. After World War I, the Allied powers organised plebiscites in Northern and Central Schleswig in 1920, which resulted in a vote for reunification with Denmark in the north and a preference for remaining in Germany in the central region. The southern third of Schleswig, however, remained a part of Germany as it was assumed that its inhabitants would choose to stay. Thus, Northern Schleswig was officially reunited with Denmark in 1920, while the remainder of Schleswig continued to be a part of the Prussian province.
The province of Schleswig-Holstein, along with the rest of Prussia, experienced significant political shifts during the Nazi regime. In 1933, with the Nazi seizure of power, the provinces of Prussia were placed under direct rule, and their legislative powers were diminished. After World War II, the province of Schleswig-Holstein became part of the British occupation zone, with some municipalities exchanged with the Soviet occupation zone.
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Austria gains Venice and northern Italy, Prussia gains Saxony and Silesia
The territorial changes that occurred in Austria and Prussia were influenced by various conflicts and negotiations throughout history. One notable example is the acquisition of Venice and northern Italy by Austria. This took place during the Congress of Vienna in 1814-1815, which aimed to restore the monarchies overthrown by Napoleon and maintain peace in Europe. As a result, Austria gained control of Venice and expanded its influence in northern Italy.
In the same period, Prussia also experienced significant territorial changes. During the Silesian Wars between Prussia and Austria in the mid-18th century, Prussia emerged victorious and gained control of the region of Silesia. This victory marked Prussia's rise as a European great power and strengthened its position in Central Europe.
Prussia's success in the Silesian Wars was followed by further territorial gains during the Austro-Prussian War of 1866. Prussia's efficient railway system enabled them to concentrate their troops effectively and rapidly. As a result of this conflict, Prussia annexed several territories, including Nassau, Hesse-Kassel, Frankfurt, and parts of Saxony. However, Prussia was unable to retain control of all its conquered territories, and some, like Saxony, were later returned to Austria.
In addition to the Austro-Prussian War, Prussia was involved in other conflicts that influenced its territorial boundaries. During the Third Silesian War, Prussian forces were concentrated in Silesia and Saxony, leaving Brandenburg vulnerable. Despite briefly occupying Berlin, the Prussian capital, the Austrians and their allies were ultimately forced to retreat. The Third Silesian War concluded with the Treaty of Hubertusburg in 1763, restoring the territorial status quo and resulting in no net territorial gains for either Prussia or Austria.
The complex dynamics between Austria, Prussia, and other European powers shaped the territorial landscape of the region. The gains made by Austria in Venice and northern Italy, as well as Prussia's control of Silesia and annexations during the Austro-Prussian War, highlight the shifting boundaries and power struggles of the time. These territorial changes had lasting impacts on the political and diplomatic relations within Europe, influencing the balance of power and setting the stage for future conflicts and alliances.
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Frequently asked questions
The territory of present-day Austria has changed drastically over time. During the Roman Empire, the region corresponded with the Roman province of Noricum. In the 19th century, this period became known as "Austria Romana". The Austrian Empire, also known as the Habsburg Empire, governed territory beyond the borders of today's Austria. In 1805, Francis II ceded large amounts of territory to Napoleon's German allies and the French Satellite Kingdom of Italy. After World War II, the German identity in Austria was weakened and the country became an independent republic again in 1955. Of the lands now part of the Second Republic of Austria, many were added over time, and parts of its former sovereign territory are now part of Italy, Croatia, Slovenia and the Czech Republic.
Prussia's territorial and jurisdictional changes have been capricious and dynamic, making it difficult to find important records. In 1525, Albrecht of Brandenburg secularized his territory and converted it into a duchy ruled in a personal union with Brandenburg, known as "Brandenburg-Prussia". In 1701, Brandenburg-Prussia became the "Kingdom of Prussia" under Frederick I. In 1772, the Kingdom of Prussia adopted the title "King of Prussia" after acquiring Royal Prussia in the First Partition of Poland. The Kingdom expanded substantially under Frederick the Great, acquiring Austrian Silesia and East Frisia on the North Sea coast.
In 1938, Austrian-born Adolf Hitler annexed Austria to Germany, which was supported by a large majority of Austrians. This unification, known as the Anschluss, was the Nazi regime's first act of territorial expansion.




















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