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The outbreak of the First World War in 1914 was the result of long-term tensions that had been building across Europe for decades. This lesson covers the key causes of those tensions, including the alliance system, imperial rivalry, militarism, and nationalism. Understanding these background factors is essential for the AQA GCSE History specification on Conflict and Tension, 1894–1918.
By the early 1900s, Europe was divided into two major alliance blocs. These alliances were originally intended to keep the peace through deterrence — the idea that no country would risk attacking another if it meant facing a powerful alliance. However, the alliances ultimately made war more likely, because a dispute between two countries could drag in all the others.
| Alliance | Members | Formed |
|---|---|---|
| Triple Alliance | Germany, Austria-Hungary, Italy | 1882 |
| Triple Entente | France, Russia, Britain | 1907 (building on Franco-Russian Alliance of 1894 and Entente Cordiale of 1904) |
Exam Tip: Be careful with the terminology. An alliance is a formal agreement to support each other in war. An entente is a less formal understanding or agreement. The Triple Entente was not a binding military alliance, but in practice it functioned as one by 1914.
By the late 19th century, the major European powers were competing fiercely for colonies and territories around the world. This imperial rivalry created distrust and antagonism.
| Crisis | Date | Detail |
|---|---|---|
| First Moroccan Crisis | 1905 | Kaiser Wilhelm II visited Tangier and declared support for Moroccan independence, challenging France's influence. An international conference at Algeciras (1906) sided with France, humiliating Germany |
| Bosnian Crisis | 1908 | Austria-Hungary annexed Bosnia-Herzegovina, angering Serbia and Russia. Russia backed down, but the crisis increased tensions in the Balkans |
| Second Moroccan Crisis (Agadir) | 1911 | Germany sent the gunboat Panther to Agadir in response to French troops entering Morocco. Britain supported France, and Germany was forced to back down again |
The major powers engaged in a massive arms race, building up their military forces in preparation for potential conflict.
| Country | Military Development |
|---|---|
| Germany | Expanded its army to over 2 million men. Launched a massive naval building programme to challenge British naval supremacy |
| Britain | Responded to the German naval threat by building Dreadnought battleships (from 1906). By 1914, Britain had 29 Dreadnoughts to Germany's 17 |
| France | Increased its army through conscription; built fortifications along the German border |
| Russia | Had the largest army in Europe (over 5 million men when fully mobilised), though it was poorly equipped |
The Anglo-German naval race was one of the most significant causes of tension. In 1898, Kaiser Wilhelm II began building a large navy under the Navy Laws, designed to challenge British naval dominance. Britain viewed this as a direct threat.
Exam Tip: The naval race is a key example of how militarism increased tensions. Britain saw its navy as essential for protecting its empire and trade routes, so Germany's naval expansion was seen as an aggressive challenge.
Nationalism — the belief that your nation is superior and should be independent and powerful — was a driving force behind many of the tensions in Europe.
| Region | Nationalist Tension |
|---|---|
| The Balkans | Known as the "powder keg of Europe." Multiple ethnic groups (Serbs, Croats, Bosnians, Bulgarians) sought independence from the Ottoman and Austro-Hungarian empires. Serbia wanted to unite all Slavic peoples in a "Greater Serbia" |
| France | French nationalism was fuelled by the desire to recover Alsace-Lorraine, lost to Germany in the Franco-Prussian War (1871) |
| Germany | Kaiser Wilhelm II pursued Weltpolitik (world policy) — a desire for Germany to have its "place in the sun" as a global power |
| Pan-Slavism | Russia saw itself as the protector of Slavic peoples in the Balkans, bringing it into conflict with Austria-Hungary |
| Figure | Role |
|---|---|
| Kaiser Wilhelm II | Emperor of Germany; pursued aggressive foreign policy (Weltpolitik) and naval expansion |
| Count von Schlieffen | German military chief who devised the Schlieffen Plan |
| Tsar Nicholas II | Emperor of Russia; supported Pan-Slavism and Serbia |
| Archduke Franz Ferdinand | Heir to the Austro-Hungarian throne; his assassination triggered WWI |
| Date | Event |
|---|---|
| 1882 | Triple Alliance formed |
| 1894 | Franco-Russian Alliance |
| 1904 | Entente Cordiale (Britain and France) |
| 1905 | First Moroccan Crisis |
| 1906 | HMS Dreadnought launched, accelerating the naval race |
| 1907 | Triple Entente formed |
| 1908 | Bosnian Crisis |
| 1911 | Second Moroccan Crisis (Agadir) |
Question (Paper 1, Q7, 12 marks, AO1+AO2): Has the alliance system been the most important reason for tensions between European powers by 1914? Explain your answer.
Worked paragraph: The alliance system was a decisive structural reason for the rapid escalation of tensions in 1914, but it was not the most important underlying cause of European rivalry. The Triple Alliance (Germany, Austria-Hungary, Italy, 1882) and the Triple Entente (France, Russia, Britain, 1907) meant that a local dispute could become a continental war within days — as it duly did after the assassination of Archduke Franz Ferdinand on 28 June 1914. Yet the alliances were themselves the product of deeper forces: the Franco-German antagonism over Alsace-Lorraine (annexed by Germany in 1871); the Anglo-German naval race after the German Navy Laws of 1898 and 1900; imperial competition in Morocco (the crises of 1905 and 1911) and the Balkans (the Bosnian Crisis of 1908); and Pan-Slav nationalism binding Russia to Serbia. The alliance system therefore magnified and channelled tensions that were created elsewhere. The most important underlying reason for tension was the convergence of imperial, military, and nationalist rivalries, which the alliance system then turned into a trigger mechanism for general war.
"The alliance system caused World War One. Germany, Austria, and Italy were in the Triple Alliance, and France, Russia, and Britain were in the Triple Entente. When one country went to war, the others had to join in." — Simple; no analysis beyond the question.
"The Triple Alliance (1882) and Triple Entente (1907) divided Europe. There was also imperial rivalry like the Moroccan crises (1905, 1911) and militarism like the naval race. Nationalism in the Balkans also caused tension." — Developed; factors listed.
"The alliance system escalated conflict because of the chain reaction it produced in 1914. However, it was itself the product of deeper rivalries: Franco-German hostility over Alsace-Lorraine since 1871, the Anglo-German naval race from 1898, and imperial competition. Without these deeper rivalries, the alliances would not have existed." — Complex: multiple causes connected.
"The alliance system was the trigger mechanism for European war in 1914, but its importance was instrumental rather than foundational. The alliances existed because European powers had already become enemies — over Alsace-Lorraine, naval supremacy, Moroccan territory, and Balkan influence. What the alliance system did was to make these rivalries binding: once Austria-Hungary attacked Serbia, Russia had to mobilise, Germany had to back Austria, France had to support Russia, and Britain had to defend Belgium. The most important underlying reason for tensions was the convergence of imperialism, militarism, and nationalism; the alliance system was the mechanism by which those tensions produced war." — A sustained argument with a controlling distinction (trigger versus foundation).
Examiner Reward Box
Examiners reward candidates who can move beyond MAIN (Militarism, Alliances, Imperialism, Nationalism) as a checklist to show how the four factors interacted. Strong answers distinguish between underlying causes (imperial rivalry, national ambition, military build-up) and triggering causes (the July Crisis, the alliance commitments). Always use specific dates and names — Tangier 1905, Agadir 1911, Bosnia 1908 — rather than "the crises in Morocco."
Christopher Clark (The Sleepwalkers: How Europe Went to War in 1914, 2012) argues that the war was a collective failure of European statecraft, not the product of a single guilty power. Clark stresses how each government convinced itself it was acting defensively while pursuing policies that looked aggressive to its neighbours.
Margaret MacMillan (The War That Ended Peace: The Road to 1914, 2013) emphasises the role of individual decision-makers — Wilhelm II's bluster, Grey's hesitation, Berchtold's miscalculation — against a backdrop of structural tensions. For AQA candidates, engaging with these interpretations shows that the "causes of the First World War" remain actively contested among historians.
One of the most productive ways to approach the AQA specification on pre-war tensions is to weigh long-run structural causes against short-run diplomatic ones. Christopher Clark, in The Sleepwalkers: How Europe Went to War in 1914 (2012), insists that Europe "sleepwalked" into catastrophe through a sequence of contingent July 1914 decisions, and warns that reading the war back from its outbreak produces a false sense of inevitability. Clark argues that "the outbreak of war in 1914 is not an Agatha Christie drama at the end of which we will discover the culprit standing over a corpse," but rather "a tragedy, not a crime" — a verdict that pushes candidates away from single-cause explanations such as "German war guilt."
Margaret MacMillan, in The War That Ended Peace: The Road to 1914 (2013), strikes a different balance. She accepts Clark's point that individual statesmen — Bethmann Hollweg, Grey, Berchtold — made choices that could have been otherwise, but she insists that "the long peace" had been hollowed out by three decades of militarism, imperial rivalry, and nationalist assertion. For MacMillan, the alliance system was a structural amplifier: the Franco-Russian Convention of 1894, the Entente Cordiale of 1904 and the Anglo-Russian Entente of 1907 converted local quarrels into continental risks. This debate connects directly to Lesson 2's treatment of the Schlieffen Plan (where contingency and structure collide in Moltke's railway timetables) and to Lesson 5's battles of attrition, whose ferocity only makes sense against the decades of military build-up described here.
The alliance system was the most important cause of rising tensions because it converted every other factor into a continental crisis. Imperial rivalry in Morocco or the Balkans could have been contained bilaterally; the naval race was, by 1912, slowing. What made July 1914 different was that the Triple Alliance and Triple Entente, forged between 1882 and 1907, guaranteed that an Austro-Serbian quarrel would pull in Russia, Germany, France and Britain within a week. As Clark argues, the system turned statesmen into "sleepwalkers."
By 1914, Europe was a powder keg of competing alliances, imperial rivalries, military build-ups, and nationalist ambitions. The alliance system meant that a local dispute could quickly escalate into a continent-wide war. Imperial rivalry and the naval race had poisoned relations between the great powers, while nationalism — particularly in the Balkans — created flashpoints for conflict. All that was needed was a spark.
Exam Tip: For "Explain" questions on the causes of WWI, use the framework of MAIN — Militarism, Alliances, Imperialism, Nationalism. Then add specific examples and link the factors together to show how they interacted.
The long-term tensions surveyed in this lesson only take on their full meaning when read forward into Lesson 2 (the Schlieffen Plan and July 1914) and Lesson 10 (the armistice and settlement). The alliance system does not, on its own, cause the war — but it converts the Sarajevo shooting into a continental conflict, exactly the mechanism Lesson 2 describes when Austria's ultimatum to Serbia activates Russia, Germany, France, and finally Britain in sequence. The naval race covered here also anticipates Lesson 6, where the same Dreadnoughts we see launched in 1906 sit at anchor off Scapa Flow because, in Christopher Clark's phrase from The Sleepwalkers (2012), "the fleet that had been built to fight a decisive battle could not be risked in one." The Anglo-German antagonism that makes the Admiralty cautious is already baked in by 1912.
Margaret MacMillan, in The War That Ended Peace (2013), argues that Europe in 1914 was "not fated" to go to war: leaders had agency, and the crises of 1905, 1908, and 1911 had all been resolved peacefully. That view pushes against a purely structural reading of MAIN. David Stevenson (Armaments and the Coming of War, 1996) disagrees in emphasis, stressing that the arms race itself created an incentive to strike before windows of military advantage closed — a pressure that returns in Lesson 2 when Moltke urges Bethmann-Hollweg that "we shall never hit it again so well as we do now." Hew Strachan (The First World War: Volume I, 2001) suggests treating alliances, imperialism, and nationalism as mutually reinforcing rather than as rival explanations, which is the synoptic move AQA examiners reward at Level 4.
Worked Q7 comparative judgement (Level 4 language): "The alliance system was important as a transmission mechanism, but militarism mattered more as a cause of tension because the naval race and continental arms build-up created the time pressure that turned the July Crisis into war. This complex argument is developed with a sustained line of reasoning: alliances were the wiring, but militarism supplied the current."
This content is aligned with the AQA GCSE History (8145) specification.