Analyze how militarism, imperialism, nationalism and alliances caused World War I

Learning goal: Explain how the causes of World War I included militarism, imperialism, nationalism and alliances, distinguish these long-term causes from the short-term crisis of July 1914, and evaluate how they worked together.

Four long-term causes. Historians often summarize the underlying causes of the war with four terms. Each is a condition that made war more likely; none by itself made war inevitable.

Militarism is the belief that a nation should build strong armed forces and be ready to use them, and the influence of military leaders and planning on policy. Before 1914 the great powers expanded their armies with conscription and competed in arms. The Anglo-German naval race was the sharpest example: Germany built a large battle fleet, and Britain responded by launching HMS Dreadnought in 1906, a new class of battleship that both sides then raced to build. War plans made the situation more dangerous. Germany's plan, associated with Alfred von Schlieffen, assumed a two-front war and called for a rapid attack through Belgium to defeat France before turning on Russia, so that once Russia mobilized, Germany's plan required it to strike France quickly. Timetables left little room for diplomacy.

Imperialism caused rivalry among the powers over colonies and influence. Germany, unified only in 1871, sought colonies and a "place in the sun" and resented Britain's and France's empires. Two crises over Morocco, in 1905 and 1911, saw Germany challenge French influence there; both times Britain backed France, which drew those two countries closer and deepened German fears of encirclement.

Nationalism, intense loyalty to one's nation, worked in two ways. Among great powers it encouraged pride, rivalry and the belief that national honor required standing firm. Among peoples within empires it produced demands for independence or unity. In the Balkans, Serbia sought to unite South Slavs, including those living inside Austria-Hungary, while Austria-Hungary, a multinational empire, saw Serbian nationalism as a threat to its survival. Austria-Hungary's annexation of Bosnia-Herzegovina in 1908 angered Serbia; the Balkan Wars of 1912–1913 enlarged Serbia and left the region tense.

Alliances divided Europe into two armed camps. The Triple Alliance of 1882 joined Germany, Austria-Hungary and Italy. Opposite it stood the Triple Entente: France and Russia allied in 1894, Britain and France reached the Entente Cordiale in 1904, and Britain and Russia settled their differences in 1907. The Entente agreements were not all binding military alliances, but they created expectations of support. Alliances were meant to deter war; instead they helped turn a local conflict into a general one.

The short-term cause: the July Crisis. On 28 June 1914 Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie were assassinated in Sarajevo, Bosnia, by Gavrilo Princip, a Bosnian Serb nationalist linked to a secret Serbian nationalist organization. Germany promised Austria-Hungary its full support (the so-called "blank check"). Austria-Hungary sent Serbia a harsh ultimatum and, finding the reply unsatisfactory, declared war on 28 July. Russia, Serbia's protector, began mobilizing; Germany declared war on Russia (1 August) and France (3 August) and on 4 August invaded Belgium to carry out its war plan; Britain, which had guaranteed Belgian neutrality, declared war on Germany on 4 August. Italy did not join its allies in 1914 and entered the war on the Entente side in 1915.

Why leaders accepted the risk. One further condition helps explain why decisions in July 1914 were taken so quickly. Many military and political leaders expected a short war, over within months, because recent wars such as the Franco-Prussian War of 1870–1871 had been short. They underestimated how machine guns, artillery and railways would favor defenders and produce years of trench warfare. The declining Ottoman Empire had also left a power vacuum in the Balkans that Austria-Hungary, Russia and the Balkan states all sought to fill. These expectations and rivalries did not replace the four main causes; they made leaders more willing to act on them.

Worked model of how the causes interacted. Trace one step: Princip's act was an expression of nationalism (short-term trigger). Austria-Hungary's decision to crush Serbia was driven by fear of South Slav nationalism. Alliance commitments and expectations of support, together with each government's own decisions, brought in Russia and Germany. Militarism, in the form of rigid mobilization plans, meant Russian mobilization led quickly to German attack through Belgium. Britain was tied to France only by an entente, not a binding alliance, but the naval race and imperial rivalry had made it suspicious of Germany, and its government chose war when Belgium was invaded. Each cause supplied a link in the chain.

Misconception and interpretation. The assassination did not "cause" the world war by itself; similar crises in 1905, 1908, 1911 and 1912–1913 had passed without general war. Historians also disagree about responsibility. The Treaty of Versailles blamed Germany and its allies; some historians have emphasized German aims, while others argue that leaders across Europe "sleepwalked" into war through miscalculation. These are interpretations, and students should label them as such and test them against evidence.

Worked classification: Classify each: (a) Britain launches HMS Dreadnought, 1906; (b) the Moroccan crises of 1905 and 1911; (c) Serbian nationalist societies; (d) the Franco-Russian alliance of 1894; (e) the Schlieffen Plan. Solution: (a) militarism (naval arms race); (b) imperialism (rivalry over colonies), also strengthening alliances; (c) nationalism; (d) alliances; (e) militarism (war plans driving decisions). Several items fit two categories, which is why the causes are best seen as interacting.

Worked sequence: Put in order and explain the link each time: Britain declares war (4 Aug); assassination (28 June); Germany invades Belgium; Austria-Hungary declares war on Serbia (28 July); Russia mobilizes. Solution: assassination → Austria-Hungary declares war on Serbia → Russia mobilizes in support of Serbia → Germany declares war and invades Belgium under its plan to defeat France first → Britain declares war over Belgian neutrality and the Entente. Each step is a cause-and-effect link, not only a sequence.

Worked counterfactual test: If there had been no alliance system, would the assassination have led to a world war? Reasoning: likely a third Balkan war between Austria-Hungary and Serbia, since alliance commitments and expected support were a large part of why Russia, Germany and France went to war. They do not explain everything: Britain's entente was not a binding alliance, and its government decided for war over Belgium and its own strategic interests, while Italy, a member of the Triple Alliance, stayed neutral. This suggests that alliances did much to turn a local war into a general one, while nationalism supplied the local conflict. A counterfactual is a thinking tool, not evidence: it helps test how much a cause mattered, but it cannot prove what would have happened, and strategic interests might have drawn some powers in even without alliances.

MAIN causes chart: Create a chart with four columns—militarism, imperialism, nationalism, alliances. Under each, list two specific pieces of evidence with dates and one sentence on how that cause connected to the July Crisis of 1914.

Independent performance: Write a 400-word essay on "Which cause of World War I was most important?" Success criteria: a thesis ranking one cause; evidence for all four causes with correct names and dates; a paragraph distinguishing the long-term causes from the short-term trigger of 28 June 1914; an explanation of how at least two causes interacted; and a labeled statement of one historical interpretation of responsibility that the essay supports or challenges.