7.3 National Unification and Diplomatic Tensions

How did Italy and Germany unify in AP European History?

Italy and Germany both unified in the mid to late 1800s because the Concert of Europe broke down (especially after the Crimean War) and skilled leaders pushed nationalism to build stronger states. In Italy, Cavour's diplomacy plus Garibaldi's military campaigns did the work; in Germany, Bismarck used Realpolitik, industrialized warfare, and political manipulation. These new powers reshaped the European balance of power and helped set up the alliance tensions that later led to World War I.

more resources to help you study

practice multiple choiceFRQ practice & scoringcheatsheetsscore calculatorAMSCO guided noteskey terms

Why This Matters for the AP European History Exam

This topic is a causation hub. It connects nationalism from earlier in Unit 7 to the imperial rivalries and Great Power tensions that close out the 19th century and open the door to World War I in Unit 8. On the exam, you can use Italian and German unification as strong evidence in any prompt about nationalism, state-building, shifts in the balance of power, or the long-term causes of WWI.

The skills you build here, especially explaining causation and comparing two unification movements, show up across multiple-choice analysis and free-response argument writing. Being able to compare how Italy and Germany unified (and why their methods differed) gives you flexible evidence for comparison and continuity/change prompts.

Key Takeaways

• The Crimean War exposed Ottoman weakness and helped break down the Concert of Europe, creating room for Italy and Germany to unify after centuries of fragmentation.
• Italian unification combined Cavour's diplomatic strategy with Garibaldi's popular military campaigns under the leadership of Victor Emmanuel II.
• Bismarck unified Germany through Realpolitik: practical diplomacy, industrialized warfare, modern weaponry, and manipulation of democratic mechanisms.
• After 1871, Bismarck built a complex alliance system aimed at isolating France and keeping the balance of power stable.
• His dismissal in 1890 helped produce mutually antagonistic alliances and rising international tension.
• Nationalist tensions in the Balkans pulled the Great Powers into repeated crises that led toward World War I.

Unification of Italy

Italian nationalists wanted to join the fragmented Italian states into one country, a movement known as the Risorgimento. The two forces that made it happen were diplomacy and popular military action.

• Leadership under Piedmont-Sardinia: Victor Emmanuel II served as the figurehead, while his prime minister, Count Camillo di Cavour, ran the diplomatic strategy. Cavour built alliances (notably with France) to weaken Austrian control in northern Italy.
• Garibaldi's military campaigns: Giuseppe Garibaldi, a popular nationalist leader, led volunteer forces (the Red Shirts) in successful campaigns in Sicily and southern Italy, removing the ruling Bourbons from the south.
• Completing unification: Cavour's diplomacy and Garibaldi's campaigns combined to bring most of the peninsula together. Venetia was added after the Austro-Prussian War, and Rome became the capital after French troops withdrew during the Franco-Prussian War.

The big idea to remember: Italian unification was a partnership between top-down diplomacy and bottom-up popular military force.

Unification of Germany

German unification was a more deliberate, militarized process led by Otto von Bismarck, the prime minister of Prussia. His approach is the textbook example of Realpolitik, meaning policy driven by practical national interest rather than ideals or emotion.

Bismarck used a series of wars and diplomatic moves to bring the German states together under Prussian leadership.

1. War with Denmark (1864): Prussia and Austria teamed up over Schleswig and Holstein, territories with German-speaking populations.
2. Austro-Prussian War (1866): Bismarck engineered conflict with Austria, then won quickly. This excluded Austria from German affairs and confirmed Prussian leadership through the North German Confederation.
3. Franco-Prussian War (1870-1871): Bismarck provoked tensions with France, and war rallied the southern German states to join Prussia against a common enemy.

The Prussian victory and the capture of Napoleon III led to the proclamation of the German Empire in 1871, with King Wilhelm I of Prussia becoming the first Kaiser of a united Germany.

Compare the two unifications: Italy leaned on alliance-building plus a popular hero, while Germany ran on calculated wars and Prussian military strength. Both used nationalism, but the methods differed.

Diplomatic Tensions and Alliances

Adding two strong new states to the map shifted the European balance of power and forced everyone to rethink their alliances.

France and Germany

The Franco-Prussian War ended with France's defeat and the loss of Alsace and Lorraine. That humiliation created deep, lasting French resentment toward the new German Empire and shaped European diplomacy for decades.

Bismarck's Alliance System

After 1871, Bismarck's main diplomatic goal was to keep France isolated and prevent it from finding allies to seek revenge. He built a network of agreements to maintain the balance of power. Examples of these arrangements include the Three Emperors' League, the Triple Alliance, and the Reinsurance Treaty.

When Bismarck was dismissed in 1890, his careful system unraveled. Over time, this helped produce two rival, mutually antagonistic alliance blocs and raised international tensions.

Austria-Hungary and Internal Nationalism

The Austrian Empire struggled with nationalist movements from its many ethnic groups. The Compromise of 1867 created the Dual Monarchy of Austria-Hungary, recognizing the political power of the largest ethnic minority (Hungarians) in an attempt to stabilize the state. Tensions among other ethnic groups still persisted.

The Balkans and Nationalist Tensions

The Balkans became Europe's most dangerous flashpoint as nationalist movements challenged the declining Ottoman Empire and pulled the Great Powers into repeated crises. Examples of these flashpoints include the Congress of Berlin in 1878, Serbia's growing influence, the Bosnia-Herzegovina annexation crisis of 1908, and the First and Second Balkan Wars. These crises deepened nationalist rivalries and helped create the unstable conditions that led toward World War I.

How to Use This on the AP European History Exam

Multiple-Choice

Expect documents (political cartoons, treaties, speeches, maps) tied to unification or the alliance system. Connect what you read to the bigger pattern: the breakdown of the Concert of Europe, nationalism as a state-building tool, and Realpolitik. Watch for sources from Bismarck or about the Balkans and ask what motive or tension they reveal.

Free Response

Use unification as evidence in prompts about nationalism, state-building, the balance of power, or the causes of World War I.

• For causation prompts, trace the chain: Crimean War weakens the Concert of Europe, unification shifts the balance of power, alliance systems harden, Balkan crises light the fuse.
• For comparison prompts, contrast Cavour and Garibaldi's combined approach in Italy with Bismarck's war-driven Realpolitik in Germany.
• Always back claims with specific evidence (named wars, leaders, treaties) rather than vague statements about "nationalism."

Common Trap

Do not stop your analysis at 1871. The stronger answers explain how unification reshaped diplomacy afterward, especially how a powerful Germany and a resentful France changed the alliance map.

Common Misconceptions

• "Italy and Germany unified the same way." They both used nationalism, but Italy relied on diplomacy plus a popular military hero, while Germany relied on Bismarck's calculated wars and Prussian power. Treating them as identical loses comparison points.
• "The Crimean War directly unified Italy and Germany." It did not. It weakened the Ottoman Empire and helped break down the Concert of Europe, which created the conditions that made unification possible. That is an indirect cause, not a direct one.
• "Realpolitik means evil or reckless policy." It means practical decision-making based on national interest rather than ideals or emotion. Bismarck's moves were calculated, not random.
• "Bismarck wanted constant war and chaos." After 1871 he actually worked to keep the peace and isolate France through alliances. The dangerous, rival alliance blocs grew more out of what happened after his dismissal in 1890.
• "The Balkan Wars were minor regional events." They sharpened nationalist tensions and drew in the Great Powers, helping build the unstable environment that led to World War I.

Related AP European History Guides

• Unit 7 Overview: 19th-Century Perspectives and Political Developments
• 7.6 New Imperialism: Motivations and Methods
• 7.2 Nationalism
• 7.1 Context of 19th Century Politics
• 7.7 Imperialism’s Global Effects
• 7.4 Darwinism and Social Darwinism