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IB HISTORY · 1871 – 1923 · 15 CHAPTERS

IB History: The First World War — notes, maps and essay questions

How Europe split into two armed blocs, why a Balkan quarrel became a world war, and why the map drawn in 1919–1923 settled so little — the war and its whole European arc on one living map.

IB notes for this atlas are in preparation. Meanwhile, this page gathers the study notes every one of its 15 chapters already carries: why each episode happened, the moment it turned on, what it changed, and the question historians still argue about. It also shows where the atlas fits the IB course.

Map from The Great War, 1871–1923, chapter 3: The Powder Keg
THE GREAT WAR, 1871–1923 · CHAPTER 3
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Where it fits the course

The atlas is filed under Paper 2 (Conflict) and Paper 3 for Higher Level (Europe, (1871–1923)). Its IB notes, with evidence lists, primary sources and model essay plans, are in preparation. These are the IB History pages for the parts of the course it serves:

Why it began

Causation questions start at the beginning. These are the causes the atlas’s opening chapters argue, each in a few sentences you can test against your own reading.

Chapter 1: Bismarck’s Europe and the Two Blocs

A new giant in the middle of Europe. Unification turned a loose group of German states into an empire with the largest population west of Russia and the fastest-growing industry on the continent. Its population rose from about 41 million in 1871 to about 65 million by 1910, while France’s stalled near 39 million, and by 1913 Germany produced more than twice as much steel as Britain. Every other power had to decide how to live beside such a neighbour, and that question, more than any single treaty, set the problem the alliance system tried to solve.

Alsace-Lorraine and the French grievance. The peace that completed German unity also guaranteed French hostility. The Treaty of Frankfurt took Alsace and most of Lorraine, with about 1.5 million people, and imposed an indemnity of five billion francs, much as a court today orders a losing party to pay damages. France paid the money within three years, but the lost provinces stayed a permanent wound in French politics, so Bismarck’s diplomacy spent twenty years containing a grievance that his own victory had created.

The Eastern Question. The slow retreat of the Ottoman Empire, the Turkish-ruled state that had governed the Balkans for centuries, left a vacuum that Austria-Hungary and Russia both wanted to fill. Russia saw itself as the protector of the Orthodox Slavs and wanted free passage for its warships through the Straits, while Austria-Hungary feared that strong Slav states on its border would unsettle the Slavs inside its own empire. Diplomats called the problem of who would inherit the Ottoman lands the Eastern Question, and because both rivals were Germany’s partners, every Balkan crisis forced Berlin to choose between them.

The Kaiser’s new course. The new Kaiser’s determination to rule in person ended Bismarck’s system within two years. Wilhelm II, emperor from 1888 at the age of twenty-nine, forced Bismarck to resign in March 1890. His new chancellor, Leo von Caprivi, and the foreign office adviser Friedrich von Holstein wanted a simpler, more transparent policy, and they judged the Reinsurance Treaty incompatible with the alliance with Austria-Hungary. Their search for clarity cut the hidden link that had kept Russia from looking to Paris, so German policy became easier to read at exactly the moment it became more dangerous.

Chapter 2: The Balkan Crises

The Ottoman retreat. The Ottoman Empire had been losing Balkan land since the Congress of Berlin, and the Young Turk revolution of 1908 and the Italian war of 1911–12 convinced its neighbours that the moment to seize the rest had come. Each loss reopened the Eastern Question, the problem of who would inherit the Ottoman lands, and each answer brought Austria-Hungary and Russia closer to collision. These crises were the final settlement of that question, fought out while the great powers watched from either side.

Serbia’s turn toward Russia. Serbia changed sides in 1903, turning a client of Austria-Hungary into its rival. Its Obrenović kings had been bound to Vienna by a secret treaty of 1881, until army officers murdered King Alexander and Queen Draga that year and brought in a new dynasty that looked to Russia and to the dream of uniting the South Slavs. Austria-Hungary answered with a trade boycott, the “Pig War” of 1906–09, named after Serbia’s main export, which only pushed Serbia toward French loans and Russian protection. Economic pressure meant to bring Serbia to heel made it more defiant.

A Habsburg empire afraid for its South Slavs. Austria-Hungary, ruled by the Habsburg dynasty, governed about seven million South Slavs, the southern Slav peoples: Croats, Serbs, Slovenes and Bosnian Muslims. Its leaders feared that a successful Serbia would draw them away, much as the small kingdom of Piedmont had pulled Italians out of Habsburg rule when it united Italy in the 1860s. Annexing Bosnia was meant to end any Serbian claim to the province for good, yet it handed Serbian nationalists a grievance, and secret societies such as Unification or Death, the Black Hand, founded in 1911, recruited young Bosnian Serbs. The cure Vienna chose deepened the disease.

Russia’s need to recover face. Defeat by Japan in 1905 and the revolution that followed left Russia unable to fight in 1909, and Germany’s demand that it accept the annexation was remembered in St Petersburg as a public humiliation. From 1910 Russia rebuilt its army with French money and turned its foreign policy back toward the Balkans, where it sponsored the Balkan League as a barrier to Austria-Hungary. A great power that believed it had been humiliated once was determined that the next crisis would prove it could not be ignored.

Chapter 3: The Powder Keg

The alliance machine. Bismarck built alliances to isolate crises; his successors built ones that connected them. By 1914 a Balkan quarrel mechanically summoned five great powers: Austria could not punish Serbia without Russia, Russia could not face Austria without Germany intervening, Germany could not fight Russia without first — by plan — attacking France. The system designed to deter war transmitted it instead.

Timetables as destiny. Every staff believed the next war would be won by whoever concentrated first; Germany’s Schlieffen Plan needed France beaten in six weeks before Russia’s slow mobilization arrived. That meant Germany literally could not wait out a Russian mobilization — military logic overrode diplomacy in the exact days when diplomacy needed time. “Mobilization means war” was not a metaphor; it was the operating system.

Austria-Hungary’s existential fear. The Dual Monarchy — eleven nationalities under one aging emperor; note on this map how much of it is not Austria or Hungary — saw South Slav nationalism, sponsored from Belgrade, as a mortal disease. Vienna wanted a local war to destroy Serbia while it still could. The assassination was the pretext; the policy was pre-existing.

Germany’s closing window. Berlin’s planners watched Russia’s French-financed railways and expected to be unbeatable no longer after 1917. A strong current in the leadership reasoned: if war with Russia is coming, better now. Historians still argue how deliberate this was — the Fischer thesis says very; others see reckless brinkmanship that expected Britain to stand aside. Either way, Berlin chose escalation at every branch.

Chapter by chapter

The atlas has 15 chapters. For each, the causes it explains and the moment it turns on; the title opens the chapter’s free page with the full explanation, a discussion question and the map.

1. Bismarck’s Europe and the Two Blocs

CHAPTER 1 · 1871–1907

Why it happened: A new giant in the middle of Europe · Alsace-Lorraine and the French grievance · The Eastern Question · The Kaiser’s new course

The turning point: Kronstadt, July 1891.

2. The Balkan Crises

CHAPTER 2 · 1908–1913

Why it happened: The Ottoman retreat · Serbia’s turn toward Russia · A Habsburg empire afraid for its South Slavs · Russia’s need to recover face

The turning point: The Bosnian crisis, September 1908 – March 1909.

3. The Powder Keg

CHAPTER 3 · JUNE–AUGUST 1914

Why it happened: The alliance machine · Timetables as destiny · Austria-Hungary’s existential fear · Germany’s closing window

The turning point: Sarajevo, 28 June 1914.

4. The Guns of August

CHAPTER 4 · AUG–SEP 1914

Why it happened: The two-front arithmetic · A plan diluted, or a plan impossible? · Plan XVII and the cult of the offensive · Russia moves early — for its ally

The turning point: The Marne, 5–12 September.

5. The Trench

CHAPTER 5 · THE SYSTEM, 1914–1918

Why it happened: Firepower outran mobility by a generation · The defender’s railway advantage · Density: no flanks to turn · Attack anyway: the political imperative

The turning point: First Ypres, October–November 1914.

6. The Widening War

CHAPTER 6 · 1915

Why it happened: The “easterner” temptation · Italy auctioned · Bulgaria’s price · Why the east bent when the west would not

The turning point: Gorlice–Tarnów, 2 May 1915.

7. The Furnaces

CHAPTER 7 · 1916

Why it happened: Attrition chosen, not stumbled into · Coalition warfare sets the calendar · Brusilov’s method: why it worked once · Romania reads the map wrong

The turning point: Verdun holds — and consumes its designer.

8. The Slowest Weapon

CHAPTER 8 · 1914–1918 · THE WAR AT SEA

Why it happened: Why Germany built a fleet it couldn’t use · The blockade’s legal fiction · Holtzendorff’s spreadsheet · Why convoy waited three years

The turning point: Convoy adopted, May 1917.

9. The World’s War

CHAPTER 9 · 1914–1918 · THE GLOBAL WAR

Why it happened: Empires wage war with empires · Japan’s calculated loyalty · The double promise · Lettow’s method — and its price

The turning point: The double promise, 1916.

10. Breaking Points

CHAPTER 10 · 1917

Why it happened: Russia: defeat metabolized as treason · Why the Provisional Government kept fighting · The mutiny that wasn’t quite · Stormtroop and tank: the lock picked twice

The turning point: The October Revolution, 7 November 1917.

11. Brest-Litovsk: The Gamble in the East Pays

CHAPTER 11 · WINTER 1917–18

Why it happened: Lenin’s cold arithmetic · Germany’s eastern ideology · The garrison paradox

The turning point: The treaty signed, 3 March 1918.

12. The Spring Offensives and the Hundred Days

CHAPTER 12 · MAR–NOV 1918

Why it happened: Why the trench finally broke · Ludendorff’s strategic vacuum · The American weight, actual and virtual · The soft fronts were structural

The turning point: Amiens, 8 August 1918.

13. Armistice

CHAPTER 13 · NOVEMBER 1918

Why it happened: Collapse from the rear, forced from the front · Why an armistice, not a surrender · The pandemic’s war logistics

The turning point: The eleventh hour, 11 November 1918.

14. The Peace That Failed

CHAPTER 14 · 1919 AND AFTER

Why it happened: Three peacemakers, three incompatible peaces · The reparations tangle · Self-determination’s impossible geometry · Enforcement: the peace nobody guarded

The turning point: The Hall of Mirrors, 28 June 1919.

15. The New Map of Europe

EPILOGUE · 1919–1923

Why it happened: The method Versailles set · Empires that collapsed into a vacuum · Promises made in wartime · The Bolshevik challenge

The turning point: Lausanne, 24 July 1923.

Essay questions, argued

Every chapter ends with a discussion question that historians still argue about, with our answer in brief. Use them as essay practice: plan your own answer, then read how we would argue it.

DISCUSSION QUESTION · CHAPTER 1

Did Bismarck’s alliance system keep the peace, or did it build the trap that closed in 1914?

HOW WE WOULD ARGUE IT

The case for the system is that it worked while Bismarck ran it, since no war between great powers broke out between 1871 and 1890 and Germany used its alliances to restrain its partners as much as to protect itself. The case against it is that this peace rested on secret and contradictory promises, such as the Reinsurance Treaty and the Dual Alliance, that only Bismarck could balance, and that the Dual Alliance of 1879 tied Germany permanently to Austria-Hungary’s Balkan fears. Historians who emphasise structure, such as Christopher Clark, note that the bloc system of 1914 grew from the abandonment of Bismarck’s methods after 1890, when his successors let Russia go and then alarmed Britain. Others, following Fritz Fischer, stress the continuity of German ambition from the 1890s to 1914. A balanced judgement is that the system postponed the consequences of German unification without resolving them. The lesson travels well beyond 1914, because a security order that depends on one person’s skill is fragile, whereas one built into institutions can outlast its inventor.

The chapter behind it: Bismarck’s Europe and the Two Blocs. Every chapter’s question is on the discussion questions page.

DISCUSSION QUESTION · CHAPTER 6

Gallipoli: a brilliant strategy ruined by execution, or a bad idea rescued by nothing?

HOW WE WOULD ARGUE IT

Make both cases honestly. For the concept: the Ottoman Empire was the bloc’s weakest member; the straits were the only route to resupply Russia at scale, whose shell famine was real; success might have swung the neutral Balkans. Against it: the naval-only attempt forfeited surprise; minesweepers crewed by civilians turned back under fire; the land plan assumed terrain and an enemy that didn’t exist — ridge country, and an Ottoman army that fought superbly under Kemal on interior lines. The execution was unarguably botched (August’s Suvla landing met almost no opposition and dug in on the beach). Most historians now judge: a genuine strategic idea, of a difficulty its authors never grasped — the gap between “worth trying” and “achievable with 1915’s tools” is where 130,000 men died. The meta-lesson: grade strategies on the capabilities you have, not the ones the map assumes.

The chapter behind it: The Widening War. Every chapter’s question is on the discussion questions page.

DISCUSSION QUESTION · CHAPTER 11

Brest-Litovsk gave Germany everything it had wanted in the east. Why didn’t it save Germany?

HOW WE WOULD ARGUE IT

Separate the prize from the price and the clock. The prize was real but slow: grain, oil (Romania), a one-front war — assets that pay out over years. The price was immediate: a million-man garrison, allies and neutrals shown a portrait of German victory, and the abandonment of any negotiated exit (who negotiates with an appetite like that?). And the clock was American: the treaty’s gains could only matter if converted into victory before the summer of 1918 — which meant risking everything on offensives (Ch. 12) that consumed precisely the divisions the east had freed. The general lesson is about time-domain strategy: an asset that pays in years is worthless in a game decided in months — unless it changes the months. Brest-Litovsk didn’t; it just raised the stakes of losing them.

The chapter behind it: Brest-Litovsk: The Gamble in the East Pays. Every chapter’s question is on the discussion questions page.

DISCUSSION QUESTION · CHAPTER 15

“In 1919–1923 armies drew the map of Europe, and treaties only signed it.” How far do you agree?

HOW WE WOULD ARGUE IT

The claim fits the east and the south-east best. Poland’s eastern border followed the battle line of 1920, Vilnius and Memel were seized by force, and Lausanne recognised the frontier that Kemal’s army had won, so in these regions the treaties ratified facts made by soldiers. It fits the centre and west less well, where Versailles, Saint-Germain and Trianon drew frontiers that no army fought over in 1919 and the defeated states were too weak to resist. Even there the peacemakers often confirmed decisions taken by others. Plebiscites, votes in which local people chose their state, much like referendums, settled Schleswig and Upper Silesia, and new states had been proclaimed in Prague and Zagreb before the conference met. A careful answer separates the making of borders from their survival, because treaties could draw lines anywhere, while only lines backed by power, or by the consent of the people living along them, lasted. Judged that way, the instability of the 1923 map lay in the gap between borders on paper and anyone’s willingness to defend them, a gap that governments of every era should measure before they sign.

The chapter behind it: The New Map of Europe. Every chapter’s question is on the discussion questions page.

What it changed

Consequence questions need the end of the story. The final chapter, The New Map of Europe, sets out what the period left behind:

Guardians and revisionists. The map of 1923 divided Europe into states that wanted to keep the settlement and states that wanted to overturn it. France allied with Poland in 1921 and went on to sign treaties with the Little Entente of Czechoslovakia, Romania and Yugoslavia, while Germany, Hungary and Bulgaria demanded revision and Fascist Italy, a disappointed victor, increasingly joined them. The guardians were mostly new, small and divided among themselves, while the revisionists included the strongest economy on the continent, so the balance of the map favoured those who wanted to redraw it.

Minorities as pretexts. The new map made national minorities a standing source of conflict. Some 25 to 30 million Europeans lived in someone else’s nation-state, and treaties supervised by the League promised them schools in their own language and equality before the law. The League’s procedures were slow, many complaints were set aside, and governments in Warsaw, Bucharest and Belgrade pressed assimilation. In the 1930s Nazi Germany used the grievances of German minorities in Czechoslovakia and Poland as pretexts for breaking the settlement apart, turning a promise of protection into a weapon against the states that had signed it.

Hyperinflation and the radical right. The Ruhr crisis drove German inflation out of control, until in November 1923 a lifetime’s savings could not buy a loaf of bread. That same month Adolf Hitler, leader of a small Munich party, tried to seize power in the Beer Hall Putsch, an armed coup launched from a Munich beer hall, convinced the republic was about to fall. He failed and went to prison, but the year of occupation and hyperinflation left millions of Germans linking the treaty, the republic and ruin in a single memory.

From Lausanne to the next war. The wars of 1919–1922 hardened the belief that stable frontiers required nations of a single people, and the Lausanne exchange gave that belief international approval. Winston Churchill cited it in 1944 to defend expelling Germans from the lands Poland would gain, a policy carried out in 1945 after Nazi Germany’s war of conquest and occupation. The next war began in 1939 over Danzig, the German port the peace made a Free City, and the Polish Corridor that cut East Prussia off from Germany, fault lines drawn in these years.

Revision tools

The atlas ends with a map quiz that asks you to find places and moments on the map itself (part of membership and of the Exam Sprint). The quick quiz and the discussion questions with our answers are free pages on this site, and the printable study guide gathers every chapter’s notes into one document for revision.

CHAPTER 1 — BISMARCK’S EUROPE AND THE TWO BLOCSMAP QUIZQUICK QUIZPRINTABLE STUDY GUIDEDISCUSSION QUESTIONSALL 15 CHAPTERS

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