On the evening of August 3, 1914, as Europe slid into war, the British Foreign Secretary Sir Edward Grey stood at his office window watching a lamplighter in the street below. To a friend beside him he spoke a sentence that would haunt the century: "The lamps are going out all over Europe; we shall not see them lit again in our lifetime."
He was right beyond his worst fears. Over the next four years, the most advanced, wealthy, and self-confident civilization on earth turned its railways, factories, chemistry, and science to the business of killing — and killed on a scale no one had imagined possible. Roughly nine to ten million soldiers would die, an entire generation maimed or buried in the mud of France and Flanders.
How did the Europe of the Belle Époque — of electric light, world's fairs, and a century without a general war — march so eagerly into catastrophe in the summer of 1914? And once it began, why could no one stop it? Those are the questions of this lesson.
Historians have argued about the origins of the Great War for a century. A useful starting framework is the mnemonic MAIN — Militarism, Alliances, Imperialism, Nationalism — four long-term pressures that built up over the decades before 1914 and made a small spark catastrophic.
Militarism. By 1914 Europe's powers had spent a generation in an arms race. Mass conscript armies, detailed mobilization timetables, and ever-larger military budgets made war planning a permanent feature of government. The most visible rivalry was the Anglo-German naval race: Britain's launch of the all-big-gun battleship HMS Dreadnought (1906) reset the competition, and Germany's drive — under Admiral Tirpitz — to challenge British naval supremacy poisoned relations between the two states. Militarism also bred a fatalistic culture in which war was seen as natural, even glorious and purifying.
Alliances. Europe had divided into two armed camps. Bismarck's diplomacy (Lesson 16) had isolated France; after his dismissal in 1890, the system hardened into two rival blocs. The Triple Alliance (1882) bound Germany, Austria-Hungary, and Italy. Against it stood the Triple Entente, assembled from the Franco-Russian Alliance (1894), the Entente Cordiale between Britain and France (1904), and the Anglo-Russian Entente (1907) — linking France, Russia, and Britain. These alliances were meant to deter war by balancing power. Instead, they ensured that any two-power quarrel could drag in all six.
Connections (theme — the international order): The post-1815 Concert of Europe (Lesson 11) had managed great-power rivalry through cooperation and congresses. By 1914 that flexible order had calcified into two rigid, hostile blocs. The diplomatic machinery for containing a crisis had been replaced by machinery for spreading one.
Imperialism. The scramble for colonies (Lesson 18) generated repeated great-power crises that rehearsed the slide to war. Twice, France and Germany nearly came to blows over Morocco — the First Moroccan Crisis (1905) and the Agadir Crisis (1911). Colonial competition heightened mutual suspicion and tied national prestige to overseas conquest.
Nationalism. This was the most combustible force. Aggressive nationalism made war popular; but the deadliest variety was the nationalism of subject peoples inside the multiethnic empires. The Ottoman and especially the Austro-Hungarian empires ruled over restless nationalities. In the Balkans — the "powder keg" of Europe — Slavic nationalism surged. Serbia, independent and expansionist after the Balkan Wars (1912–13), dreamed of uniting the South Slavs, including the millions ruled by Austria-Hungary. Vienna saw Serbian nationalism as a mortal threat to the empire's survival.
On June 28, 1914, Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie were shot dead in Sarajevo, the capital of Austrian-ruled Bosnia, by Gavrilo Princip, a nineteen-year-old Bosnian Serb nationalist linked to a secret Serbian society, the Black Hand. The assassination was the spark, not the cause: it lit a fuse already laid by the MAIN pressures.
The month between the assassination and the outbreak of general war — the July Crisis — shows the alliance system working as a trap.
In a single week, an Austro-Serbian quarrel had become a war of all the great powers. (Italy, citing the alliance's defensive terms, stayed out — and in 1915 joined the Entente in hopes of territorial gains.)
Germany faced its nightmare: a two-front war. Its answer was the Schlieffen Plan (devised by General Alfred von Schlieffen, c. 1905) — to knock out France with a lightning blow through Belgium before slow-moving Russia could fully mobilize, then swing east. The plan demanded violating Belgian neutrality, which is precisely what brought Britain into the war and branded Germany the aggressor in Allied propaganda.
The plan failed. At the First Battle of the Marne (September 1914), French and British forces halted the German advance just short of Paris. The hope of a short, decisive war — soldiers home "before the leaves fall" — collapsed. Both sides dug in.
What followed was trench warfare and stalemate: two parallel lines of trenches snaking from the English Channel to the Swiss border, separated by a churned wasteland of mud, barbed wire, and shell craters — "No Man's Land." Defensive technology now dominated. The machine gun could cut down attacking infantry by the thousand; artillery killed more men than any other weapon. Generals hurled massed assaults across open ground for tiny gains.
The casualty figures defy comprehension. At Verdun (February–December 1916), a German offensive against the French fortress city, the two armies suffered roughly 700,000 casualties between them for almost no change in the line; the French rallying cry was "Ils ne passeront pas" — "They shall not pass." At the Somme (July–November 1916), a British offensive, nearly 20,000 British soldiers died on the first day alone (July 1, 1916), and over a million men on all sides became casualties.
New technologies made the killing industrial: poison gas (first used on a large scale by Germany at the Second Battle of Ypres, April 1915), tanks (introduced by the British at the Somme in 1916), military aircraft for reconnaissance and bombing, and submarines (German U-boats) that strangled supply lines at sea. War had become a contest of factories and chemistry as much as courage.
Connections (theme — total war): This is the central concept of the lesson. Total war means a war that mobilizes the entire society and economy, erasing the line between soldier and civilian. The Second Industrial Revolution (Lesson 17) — steel, chemicals, electricity, the assembly line — had handed states the power to arm and feed millions. WWI was the first time that power was turned, for years, on other industrial states.
Behind the trenches, governments mobilized whole populations. States imposed rationing of food and fuel, directed industry toward munitions, and exercised unprecedented control over the economy. With millions of men at the front, women entered the workforce in vast numbers — munitions factories, transport, offices, farms — an experience that strengthened the case for women's suffrage, granted in Britain (partially) in 1918. Governments deployed propaganda to sustain morale and demonize the enemy, and censored the press. The reach of the modern state expanded enormously — and did not fully retreat after 1918.
Two events transformed the war in 1917:
Free of the Eastern Front, Germany gambled everything on a final Spring Offensive (1918). It failed; Allied counterattacks, now reinforced by Americans, drove the exhausted German army back. With its allies collapsing, its navy mutinying, and revolution breaking out at home (the Kaiser abdicated), Germany sought terms.
The guns fell silent at the eleventh hour of the eleventh day of the eleventh month — November 11, 1918. An armistice, not a surrender, ended the fighting; Germany had not been invaded, a fact that later fed the poisonous "stab-in-the-back" myth that the army was betrayed by politicians at home.
The victors met at the Paris Peace Conference (1919), dominated by the "Big Four": Wilson (U.S.), Georges Clemenceau (France), David Lloyd George (Britain), and Vittorio Orlando (Italy). They clashed over aims. Wilson came with his idealistic Fourteen Points (January 1918) — self-determination, open diplomacy, freedom of the seas, and above all a League of Nations to keep future peace. Clemenceau, whose country had been invaded twice in fifty years, wanted Germany crushed and France made secure.
The compromise was the Treaty of Versailles (signed June 28, 1919 — five years to the day after Sarajevo). Its harshest terms fell on Germany: - Article 231, the "war guilt" clause, forced Germany to accept sole responsibility for the war — the legal basis for reparations (later fixed at a staggering sum) to be paid to the Allies. - Territorial losses: Alsace-Lorraine returned to France; territory ceded to a reborn Poland (the "Polish Corridor," splitting Germany); the Rhineland demilitarized; all German colonies stripped away as League "mandates." - Military restrictions: the German army capped at 100,000 men, no air force, no submarines, no tanks. - The treaty established the League of Nations — though, fatefully, the U.S. Senate rejected the treaty, and America never joined the body Wilson had championed.
Germans across the political spectrum denounced the treaty as a humiliating Diktat — a dictated peace.
Connections (forward — the seeds of the next war): Versailles satisfied no one. It was harsh enough to enrage Germany but not harsh enough to keep it down. Combined with the economic ruin of the 1920s–30s, German resentment of the "war guilt" clause and reparations became the fuel for the interwar crisis, the rise of Hitler, and World War II (Lessons 21–22). The peace of 1919 helped plant the war of 1939.
Source: Wilfred Owen, "Dulce et Decorum Est," written c. 1917–1918, published posthumously in 1920. Owen, a British officer, was killed in action on November 4, 1918 — one week before the Armistice. The poem describes a gas attack; its Latin title and closing words come from the Roman poet Horace and mean "It is sweet and fitting to die for one's country." [Authentic poem; text below is widely anthologized — verify exact wording against a standard edition of Owen's poems before publication.]
"Gas! GAS! Quick, boys!—An ecstasy of fumbling, Fitting the clumsy helmets just in time; But someone still was yelling out and stumbling And flound'ring like a man in fire or lime... Dim, through the misty panes and thick green light, As under a green sea, I saw him drowning.... My friend, you would not tell with such high zest To children ardent for some desperate glory, The old Lie: Dulce et decorum est Pro patria mori."
HAPPY analysis: - Historical context: Written near the end of the war by a serving officer who had experienced gas attacks and shell shock firsthand; it reflects the disillusionment of the trench generation after years of industrialized slaughter. - Audience: The civilian home front — especially those who romanticized the war — and a postwar readership; Owen addresses "my friend" directly. - Purpose: To shatter the patriotic glorification of war by forcing readers to see a man die of poison gas, and to expose the cheerful slogans as "the old Lie." - Point of view: A combat soldier and emerging pacifist, Owen writes against the propaganda and recruiting rhetoric of his own country — a deliberately subversive, anti-heroic viewpoint. - whY it matters: The poem is a primary source for the experience of total war and for the cultural shock it produced. It documents a specific new technology (poison gas) and, more broadly, the collapse of the nineteenth-century faith in progress and glory — the disillusionment that shaped the "lost generation" and interwar culture.
Long-term vs. short-term causes — was the war inevitable? The long-term causes are the MAIN pressures: a decades-long arms race and naval rivalry (militarism), two rigid hostile blocs (alliances), colonial friction (imperialism), and explosive Balkan and great-power nationalism. The short-term cause — the trigger — was the assassination of Franz Ferdinand and the diplomatic failures of the July Crisis. The relationship matters: the deep causes built a system so flammable that some spark was likely, but the specific war of 1914 required the specific choices of July — Austria's ultimatum, Germany's "blank check," the rigid mobilization plans. Historians still split between those who see war as nearly inevitable (a system primed to explode) and those who stress contingency (statesmen who could have stepped back but did not). The strongest answers hold both: structural pressures made war likely; human decisions made it actual.
Compare the two great peace settlements: Versailles (1919) vs. the Congress of Vienna (1815). After defeating Napoleon, the victors at Vienna (Lesson 11) deliberately treated defeated France with restraint — readmitting it as a great power, keeping the balance of power, and prioritizing legitimacy and stability over revenge. The result was roughly a century without a general European war. At Versailles, the victors chose the opposite path: punish, blame, and disarm the loser (Article 231, reparations, territorial losses) while excluding it from the new order. The result was a Germany too resentful to accept the peace and a settlement that collapsed within twenty years. The contrast is one of the course's sharpest lessons in how the terms of a peace shape the future.
Triple Alliance vs. Triple Entente — get the membership right. The Triple Alliance = Germany, Austria-Hungary, Italy. The Triple Entente = France, Russia, Britain. The classic exam trap exploits Italy: it began in the Triple Alliance but switched sides in 1915 and fought with the Entente. So "Italy was a member of the Triple Alliance" and "Italy fought on the Allied side" are both true — at different dates.
The assassination was the spark, NOT the cause. A favorite wrong answer treats Sarajevo as the reason for the war. The assassination was the immediate trigger; the war's true causes are the long-term MAIN pressures. If your explanation of WWI's origins stops at Franz Ferdinand, you have described the match but not the gunpowder.
Versailles (1919) vs. the Congress of Vienna (1815) — different centuries, opposite philosophies. Both ended a long, continent-wide war, but they are a century apart and aimed at opposite goals: Vienna sought balance and restraint and produced lasting peace; Versailles sought punishment and produced renewed war. Do not blur them. (Also keep their cities and decades straight — Vienna 1815, Versailles/Paris 1919.)
"Armistice" is not "surrender," and the war did not end in Germany. The fighting stopped by armistice on November 11, 1918, with German soil largely un-invaded — a fact later twisted into the "stab-in-the-back" myth. And the Fourteen Points were Wilson's proposal; the Treaty of Versailles was the much harsher result. Don't equate them.
1. B — MAIN = Militarism, Alliances, Imperialism, Nationalism, the four long-term causes.
2. B — The Triple Alliance (1882) = Germany, Austria-Hungary, Italy. (A) is the Triple Entente.
3. B — The assassination of Franz Ferdinand at Sarajevo (June 28, 1914) was the immediate spark. (A) and (C) are later events; (D) is the 1918 treaty ending Russia's war.
4. B — The Schlieffen Plan aimed to knock France out quickly via Belgium, then turn east against Russia, to avoid a sustained two-front war.
5. A — The invasion of neutral Belgium violated the 1839 treaty Britain had guaranteed and brought Britain into the war (August 4, 1914).
6. B — Trench warfare produced a long stalemate with massive casualties (Verdun, the Somme) for tiny territorial change.
7. B — Total war = mobilizing a society's entire economy and population, blurring the soldier–civilian divide.
8. B — In 1917 the U.S. entered (Zimmermann Telegram, unrestricted submarine warfare) and Russia exited (revolution; Brest-Litovsk, March 1918).
9. B — The Zimmermann Telegram (a German proposal that Mexico attack the U.S.) helped push the United States into the war in April 1917.
Stimulus for Questions 10–11. Read the excerpt.
"Gas! GAS! Quick, boys!—An ecstasy of fumbling, / Fitting the clumsy helmets just in time... / My friend, you would not tell with such high zest / To children ardent for some desperate glory, / The old Lie: Dulce et decorum est / Pro patria mori." — Wilfred Owen, "Dulce et Decorum Est" (written c. 1917–18) [authentic; verify wording against a standard edition]
10. B — Owen calls "the old Lie" the claim dulce et decorum est pro patria mori — that it is sweet and glorious to die for one's country.
11. B — As a combat veteran's poem about a gas attack, it is evidence of soldiers' disillusionment and the brutal reality of industrialized, total war.
Stimulus for Questions 12–13. Read the excerpt from the Treaty of Versailles.
"The Allied and Associated Governments affirm and Germany accepts the responsibility of Germany and her allies for causing all the loss and damage to which the Allied and Associated Governments and their nationals have been subjected as a consequence of the war imposed upon them by the aggression of Germany and her allies." — Treaty of Versailles, Article 231 (1919) [authentic treaty text; verify against the official English text]
12. B — Article 231, the "war guilt" clause, assigned Germany responsibility and provided the legal basis for reparations. (C) and (D) are other, separate terms of the treaty.
13. B — Resentment of clauses like Article 231 helped destabilize the Weimar Republic and was exploited by Hitler, feeding the path to WWII.
14. B — Versailles was far more punitive toward the loser than the Congress of Vienna and far more likely to breed future conflict; Vienna emphasized restraint and the balance of power (A).
15. B — The "stab-in-the-back" myth falsely held that the undefeated German army had been betrayed by politicians and others at home, exploiting the fact that the war ended by armistice with German soil largely un-invaded.
This is a full SAQ. On the AP exam you have ~13 minutes per SAQ. There is no thesis required — answer each part directly in 2–4 sentences, in complete sentences (not bullet points), and make sure each part does the verb it asks for (identify vs. explain). Each of the three parts is worth 1 point (3 total).
"The lamps are going out all over Europe; we shall not see them lit again in our lifetime." — Sir Edward Grey, British Foreign Secretary, recalling the evening of August 3, 1914, in his memoir Twenty-Five Years (1925) [authentic; widely quoted — verify wording against Grey's memoir]
Using the source and your knowledge of European history, answer (a), (b), and (c).
(a) Identify ONE long-term cause of the First World War that helps explain the catastrophe Grey foresaw.
(b) Explain ONE way in which the First World War was a "total war."
(c) Explain ONE way in which the peace settlement of 1919 contributed to instability in Europe during the interwar period.
(a) One long-term cause was the European alliance system. By 1914, the great powers had divided into two armed blocs — the Triple Alliance (Germany, Austria-Hungary, Italy) and the Triple Entente (France, Russia, Britain). This meant that a quarrel between any two powers could automatically pull in all the others, which is exactly how the Austro-Serbian dispute of July 1914 became a continental war. (Accept instead: militarism/the arms race; imperialism/colonial rivalry; nationalism, especially Slavic nationalism in the Balkans.)
(b) The war was a total war because it mobilized entire societies and economies, not just armies. Governments rationed food and fuel, directed industry toward producing munitions, and — with millions of men at the front — brought large numbers of women into the workforce in factories and other jobs. This erased much of the line between soldier and civilian and harnessed the full industrial capacity of each nation to the war effort. (Accept instead: state economic control; mass propaganda and censorship; conscription of whole populations; industrialized weapons like poison gas, machine guns, tanks.)
(c) The Treaty of Versailles (1919) destabilized interwar Europe by humiliating Germany. The "war guilt" clause (Article 231) blamed Germany for the war and justified heavy reparations, while Germany also lost territory and most of its military. Germans across the political spectrum resented the treaty as a dictated peace, and this resentment weakened the Weimar Republic and was later exploited by Adolf Hitler — helping pave the way to World War II. (Accept instead: economic burden of reparations contributing to crisis; the weakness of the League of Nations, especially without U.S. membership; new national borders that left ethnic grievances unresolved.)
| Part | Earns the point | Does NOT earn the point |
|---|---|---|
| (a) Identify a long-term cause | Names a valid MAIN cause (militarism, alliances, imperialism, nationalism) — a brief, correct statement is enough | Naming the assassination of Franz Ferdinand (that is the short-term spark, not a long-term cause); a vague answer like "tension in Europe" |
| (b) Explain a feature of total war | States a feature and explains how it made the war "total" (e.g., links women's labor / rationing / war economy to full societal mobilization) | Merely naming a battle or weapon with no link to total mobilization; describing trench warfare without connecting it to the total-war concept |
| (c) Explain a 1919 consequence | Identifies a specific term of the settlement and explains how it bred interwar instability (cause → effect) | Just describing a treaty term with no instability link; vague claims like "it caused World War II" with no mechanism |
1. B — MAIN = Militarism, Alliances, Imperialism, Nationalism, the four long-term causes.
2. B — The Triple Alliance (1882) = Germany, Austria-Hungary, Italy. (A) is the Triple Entente.
3. B — The assassination of Franz Ferdinand at Sarajevo (June 28, 1914) was the immediate spark. (A) and (C) are later events; (D) is the 1918 treaty ending Russia's war.
4. B — The Schlieffen Plan aimed to knock France out quickly via Belgium, then turn east against Russia, to avoid a sustained two-front war.
5. A — The invasion of neutral Belgium violated the 1839 treaty Britain had guaranteed and brought Britain into the war (August 4, 1914).
6. B — Trench warfare produced a long stalemate with massive casualties (Verdun, the Somme) for tiny territorial change.
7. B — Total war = mobilizing a society's entire economy and population, blurring the soldier–civilian divide.
8. B — In 1917 the U.S. entered (Zimmermann Telegram, unrestricted submarine warfare) and Russia exited (revolution; Brest-Litovsk, March 1918).
9. B — The Zimmermann Telegram (a German proposal that Mexico attack the U.S.) helped push the United States into the war in April 1917.
10. B — Owen calls "the old Lie" the claim dulce et decorum est pro patria mori — that it is sweet and glorious to die for one's country.
11. B — As a combat veteran's poem about a gas attack, it is evidence of soldiers' disillusionment and the brutal reality of industrialized, total war.
12. B — Article 231, the "war guilt" clause, assigned Germany responsibility and provided the legal basis for reparations. (C) and (D) are other, separate terms of the treaty.
13. B — Resentment of clauses like Article 231 helped destabilize the Weimar Republic and was exploited by Hitler, feeding the path to WWII.
14. B — Versailles was far more punitive toward the loser than the Congress of Vienna and far more likely to breed future conflict; Vienna emphasized restraint and the balance of power (A).
15. B — The "stab-in-the-back" myth falsely held that the undefeated German army had been betrayed by politicians and others at home, exploiting the fact that the war ended by armistice with German soil largely un-invaded.
Self-check for your own response: - For (a), did you give a long-term cause (MAIN) — and not the assassination? - For (b) and (c), did you actually explain (show a causal "how/why"), not merely name a fact? - Did you write in complete sentences and clearly label (a), (b), (c)? - For (c), did you tie a specific 1919 term (Article 231, reparations, lost territory, a weak League) to interwar instability with a clear cause → effect?
EuroIQ · Lesson 19 of 25 · Period 4 · Unit 8: World War I, Revolution & the Crisis of the Twentieth Century
This lesson is exam-prep study material aligned to the AP® European History Course and Exam Description. AP® is a trademark registered by the College Board, which is not affiliated with and does not endorse this product. Dates, attributions, and translations are drawn from standard scholarly sources; readers should consult primary editions for exact wording.
Content pending external history review.