🌍 The First World War (1914–1918) — Causes, Results, Treaties & the League of Nations

1. Europe Before 1914 — A Powder Keg Waiting to Explode

The First World War was not caused by a single event. Europe in 1914 was like a powder keg — tensions had been building for decades. The assassination of Archduke Franz Ferdinand was just the spark that lit the fuse. Let me break down exactly why the war happened.

2. Causes of the First World War — The MAIN Factors

ICSE almost always asks: "Explain the causes of the First World War." The standard framework uses the acronym MAIN — but there's actually a fifth factor too. Here's the complete breakdown:

2.1 Militarism (M)

• Arms race: European powers were building massive armies and navies. Germany and Britain had a naval race — Germany passed the Naval Laws (1898, 1900) to build a navy that could challenge Britain. Britain responded with the Dreadnought battleship (1906), triggering a new level of competition.
• Conscription: Most European nations (except Britain) had conscription (mandatory military service). Germany had a standing army of ~4.5 million trained men. France had ~4 million. Russia had the largest at ~6 million.
• War plans: General staffs had detailed war plans ready — Germany had the Schlieffen Plan (attack France through Belgium, then turn on Russia), France had Plan XVII. These plans assumed war was inevitable and required rapid mobilisation — once started, it was hard to stop.
• Militarist culture: Military values (discipline, honour, obedience) were glorified in society. The military had enormous influence over civilian governments, especially in Germany (Kaiser Wilhelm II) and Russia (Tsar Nicholas II).

2.2 Alliances (A)

• Europe was divided into two hostile alliance systems that turned any local conflict into a continental war:

• Why alliances made war more likely: Once Austria-Hungary declared war on Serbia (28 July 1914), Russia mobilised to defend Serbia (its ally). Germany declared war on Russia (1 Aug) to support Austria. France was drawn in because of its alliance with Russia. Britain entered when Germany invaded Belgium (4 Aug). The alliance system meant a small conflict became a world war in less than 2 weeks.

2.3 Imperialism (I)

• Colonial rivalries: European powers competed fiercely for colonies in Africa, Asia, and the Pacific. The Scramble for Africa (1880s-1900s) created tensions — Britain and France almost went to war over Fashoda (Sudan) in 1898.
• Moroccan Crises (1905 & 1911): Germany challenged France's control over Morocco. In 1905, Kaiser Wilhelm II visited Tangier and demanded an international conference. In 1911, Germany sent a warship (Panther) to Agadir. Both times, Britain supported France, and Germany backed down — but resentment grew on both sides.
• Balkan rivalries: The declining Ottoman Empire created a power vacuum in the Balkans. Austria-Hungary and Russia both wanted influence there. Austria annexed Bosnia (1908) — angering Serbia and Russia. The Balkan Wars (1912-13) further destabilised the region.
• Economic competition: Germany's industrial growth (by 1914, Germany had surpassed Britain in steel production) created economic rivalry. Germany wanted a "place in the sun" — colonies and global influence matching its industrial power.

2.4 Nationalism (N)

• Pan-Slavism: Russia presented itself as the protector of Slavic peoples in the Balkans (Serbs, Bosnians, Bulgarians). This directly clashed with Austria-Hungary, which controlled many Slavic groups and feared disintegration.
• Nationalist groups in Austria-Hungary: The Austro-Hungarian Empire contained 11 major nationalities (Germans, Hungarians, Czechs, Slovaks, Poles, Ukrainians, Romanians, Serbs, Croats, Slovenes, Italians). Many wanted independence or autonomy. The Black Hand (a Serbian nationalist secret society) wanted to unite all South Slavs under Serbia — this directly threatened Austria-Hungary.
• French nationalism: France wanted to recover Alsace-Lorraine — territory it lost to Germany in the Franco-Prussian War (1870-71). Revenge and patriotism were powerful forces in French politics.
• German nationalism: The belief in German cultural and military superiority — "Deutschland über alles" (Germany above all). Kaiser Wilhelm II wanted Germany to be a world power.

2.5 The Balkan Problem (The Powder Keg)

• The Balkan region was the most volatile area in Europe. The Ottoman Empire ("Sick Man of Europe") was collapsing, and Austria-Hungary and Russia were competing for control of the region.
• Bosnian Crisis (1908): Austria-Hungary annexed Bosnia and Herzegovina (which it had occupied since 1878). Serbia was furious — it wanted Bosnia for a Greater Serbia. Russia was humiliated (it had to back down due to German threats).
• Balkan Wars (1912-13): The Balkan League (Serbia, Greece, Bulgaria, Montenegro) defeated the Ottoman Empire in 1912, then fought among themselves in 1913. Serbia emerged stronger, which worried Austria-Hungary.
• Serbia as a threat: By 1914, Austria-Hungary saw Serbia as an existential threat — Serbian nationalism could inspire Slavs within the Empire to rebel. The Austro-Hungarian leadership felt a preventive war against Serbia was necessary.

3. The Immediate Cause — Assassination at Sarajevo (28 June 1914)

3.1 The Assassination

• On 28 June 1914, Archduke Franz Ferdinand (heir to the Austro-Hungarian throne) and his wife Sophie visited Sarajevo, the capital of Bosnia (annexed by Austria-Hungary in 1908).
• Date was deliberately chosen — 28 June is Vidovdan (St. Vitus's Day), a Serbian national holiday commemorating the Battle of Kosovo (1389). For Serbian nationalists, this was a provocation.
• A group of seven Bosnian Serb assassins from the Black Hand (secret society led by Colonel Dragutin Dimitrijević "Apis") waited along the motorcade route.
• After a failed bomb attempt earlier that day, the motorcade took a wrong turn. The driver stopped to reverse — right in front of Gavrilo Princip, a 19-year-old Bosnian Serb student. Princip fired two shots, killing both Franz Ferdinand and Sophie.

3.2 The July Crisis — How One Murder Became a World War

4. The End of the War — Why the USA Entered (1917)

4.1 Why the US Stayed Neutral (1914–1917)

• Traditional isolationism: US foreign policy since George Washington had been to avoid "entangling alliances" with European powers.
• Large immigrant population: Millions of Americans had roots in both Allied and Central Powers countries — neutrality kept domestic peace.
• Economic interests: US businesses traded with both sides, though increasingly more with the Allies (Britain and France were buying massive amounts of US goods).

4.2 Reasons for US Entry (1917)

a) Unrestricted Submarine Warfare

• Germany declared the waters around Britain a war zone (Feb 1915) — any ship, including neutral US merchant ships, could be sunk without warning.
• Lusitania (7 May 1915): German U-boat sank the British passenger liner RMS Lusitania off the coast of Ireland. 1,198 people died, including 128 Americans. Huge outrage in the US.
• After the Lusitania, Germany briefly suspended unrestricted submarine warfare (Sussex Pledge, 1916) — but resumed it on 1 February 1917. This was the decisive trigger.

b) The Zimmermann Telegram (January 1917)

• British intelligence intercepted a secret telegram from German Foreign Minister Arthur Zimmermann to the German ambassador in Mexico.
• The telegram proposed a German-Mexican alliance — if the US entered the war against Germany, Mexico should attack the US. Germany promised Mexico the return of Texas, New Mexico, and Arizona (lost to the US in 1848).
• The British shared the telegram with the US (published 1 March 1917). Americans were furious — the telegram was an act of hostility on US soil.

c) Economic Ties to the Allies

• By 1917, US banks had lent $2.5 billion to the Allies and only $27 million to Germany. If the Allies lost, US loans would never be repaid.
• US industries had become dependent on Allied war orders.

d) Ideological Factors — "Make the World Safe for Democracy"

• President Woodrow Wilson framed US entry as a moral crusade — to make the world "safe for democracy" and end all wars.
• The US entered the war on 6 April 1917. The entry of fresh American troops (the AEF — American Expeditionary Force under General Pershing) was the turning point of the war. The Allies, exhausted after 3 years of brutal trench warfare, got millions of fresh soldiers, supplies, and a morale boost.

4.3 End of the War (1918)

• Spring Offensive (1918): Germany's last major offensive (March-July 1918) failed. The Allies, reinforced by US troops, counter-attacked.
• Hundred Days Offensive (Aug-Nov 1918): Allied forces pushed the German army back continuously. Germany's allies collapsed one by one — Bulgaria (29 Sept), Ottoman Empire (30 Oct), Austria-Hungary (3 Nov).
• Kaiser Wilhelm II abdicated (9 November). Germany became a republic.
• Armistice: On 11 November 1918, at 11:00 AM, the Armistice was signed in a railway carriage in Compiègne, France. Fighting stopped. The war was over.

5. Results of the First World War

The war had devastating consequences — political, economic, social, and diplomatic. ICSE expects you to know the key results:

5.1 Human Cost

• ~16 million deaths (9 million soldiers, 7 million civilians). Millions more wounded, maimed, or suffering from psychological trauma ("shell shock").
• France lost 1.4 million soldiers (4.3% of its population). Germany lost 2 million. Britain lost 900,000. Russia lost 1.8 million.
• Lost generation: An entire generation of young men was wiped out. In France and Germany, villages lost all their young men. This created lasting demographic and social scars.

5.2 Economic Devastation

• The war cost an estimated $338 billion (in 1918 dollars). Europe was bankrupt.
• Industries and infrastructure were destroyed across France, Belgium, and Eastern Europe. Farmland was devastated by trench warfare.
• European economies were exhausted. Germany had to pay massive war reparations. Britain and France were deeply in debt to the United States.
• The war's economic disruption led to inflation, unemployment, and social unrest across Europe — setting the stage for revolutions and extremism.

5.3 Political Upheaval — The Fall of Empires

5.4 The Russian Revolution (1917) — A Direct Result of WWI

• The war was disastrous for Russia — huge losses (~1.8 million dead), economic collapse, food shortages. Tsar Nicholas II's incompetence and the influence of Rasputin eroded public confidence.
• February Revolution (1917): Mass protests in Petrograd. The Tsar abdicated. A Provisional Government took over but continued the war — deeply unpopular.
• October Revolution (1917): Lenin's Bolsheviks seized power. They immediately signed the Treaty of Brest-Litovsk (March 1918) with Germany, giving up enormous territories in exchange for peace. This treaty was annulled after Germany's defeat.

5.5 Emergence of the USA as a World Power

• Before 1914, the US was a rising power but not a global leader. After WWI, the US emerged as the world's largest economy and a major military power.
• President Wilson was the leading figure at the Paris Peace Conference. The US had decisively tipped the balance of the war.
• Irony: Despite Wilson's leadership, the US never joined the League of Nations (Senate rejected membership) — a major blow to the League's effectiveness.

5.6 Seeds of WWII

• The harsh peace terms imposed on Germany (especially the War Guilt Clause and massive reparations) created deep resentment and economic misery — directly contributing to the rise of Hitler and Nazism.
• The redrawing of borders in Europe and the Middle East created new conflicts that persist today (Middle East tensions, Balkan conflicts).
• The League of Nations' failure to enforce the peace and maintain collective security made aggression by dictators (Hitler, Mussolini, Japan) possible in the 1930s.

6. The Peace Settlements — The Paris Peace Conference (1919–1920)

The Paris Peace Conference was held from January 1919 to January 1920 in Paris. The "Big Four" dominated: Woodrow Wilson (USA), David Lloyd George (Britain), Georges Clemenceau (France), Vittorio Orlando (Italy). Germany and the defeated powers were not allowed to participate — they were simply presented with the treaties.

6.1 Wilson's Fourteen Points (January 1918)

• President Wilson had proposed 14 Points as the basis for peace — including open diplomacy, freedom of the seas, reduction of armaments, self-determination for nations, and a League of Nations.
• However, the other Allied leaders (especially Clemenceau of France) wanted revenge and security against Germany, not Wilson's idealistic vision. The actual treaties were much harsher than Wilson wanted.

7. The Treaty of Versailles (28 June 1919) — With Germany

The Treaty of Versailles was signed exactly 5 years after the assassination of Franz Ferdinand (28 June 1914 → 28 June 1919). It was the most important and controversial of the peace treaties. It contained 440 clauses.

7.1 Key Terms of the Treaty of Versailles

7.2 Reactions to the Treaty of Versailles

8. The Treaty of Sèvres (10 August 1920) — With the Ottoman Empire

8.1 Terms of the Treaty

• The Treaty of Sèvres was the peace treaty between the Allied Powers and the Ottoman Empire (Turkey). It was signed at Sèvres, France on 10 August 1920.
• It was the harshest of all the peace treaties — the Ottoman Empire was completely dismantled:

• The Ottoman army was limited to 50,000 men. No navy, no air force.
• Financial control was given to Britain and France.

8.2 Turkish Reaction — The Treaty was Never Implemented

• The treaty was so harsh that it was rejected by Turkish nationalists led by Mustafa Kemal Pasha (Atatürk).
• The Sultan's government in Constantinople signed the treaty — but the nationalists in Ankara refused to accept it. They fought the Turkish War of Independence (1919-1923).
• Atatürk defeated Greek forces, recaptured Smyrna (1922), and forced the Allies to renegotiate.
• The Treaty of Sèvres was replaced by the Treaty of Lausanne (24 July 1923) — which was much more favourable to Turkey. It recognised the Republic of Turkey within its present borders, abolished the Capitulations, and provided for population exchange between Greece and Turkey.

8.3 Comparison — Versailles vs Sèvres

9. The League of Nations (1920–1946)

9.1 Formation and Aims

• The League of Nations was created by the Treaty of Versailles (Part I — Covenant of the League of Nations) as part of the Paris Peace Settlement.
• Founded: 10 January 1920 (when the Treaty of Versailles came into force).
• Headquarters: Geneva, Switzerland (neutral country).
• Idea proposed by: US President Woodrow Wilson — the 14th of his Fourteen Points.
• Aims: (a) Prevent future wars through collective security and disarmament, (b) Promote international cooperation, (c) Settle disputes through negotiation and arbitration, (d) Improve living and working conditions globally, (e) Enforce the peace treaties.

9.2 Structure of the League

9.3 Membership — The Biggest Problem

• USA never joined: Despite Wilson creating the League, the US Senate rejected membership (1919, 1920). The US returned to isolationism. Without the world's richest and most powerful nation, the League was severely weakened from the start.
• Germany joined late (1926), left early (1933): Germany was initially excluded. Admitted in 1926 (after Locarno Treaties). Hitler withdrew Germany in 1933.
• USSR joined late (1934), expelled early (1939): The USSR was excluded as communist. Joined in 1934. Expelled in 1939 after invading Finland.
• Japan and Italy left: Japan left in 1933 (after the League condemned its invasion of Manchuria). Italy left in 1937 (after the League condemned its invasion of Ethiopia).
• Result: By the late 1930s, the League had lost most of its major powers. It was essentially a Franco-British club with limited global reach.

10. Why the League of Nations Failed to Maintain Peace

The League had some successes in the 1920s (settling minor disputes between Sweden-Finland over the Aaland Islands 1921, Bulgaria-Greece 1925). But in the 1930s, when faced with aggression by major powers, it failed completely. Here's why:

10.1 Structural Weaknesses

1. No military force: The League had no army of its own. It could recommend action, but member states were not obligated to provide troops. Economic sanctions could take years to work.
2. Unanimity rule: All decisions (except procedural) required unanimous approval. Any member could veto any action. This made quick, decisive action impossible.
3. Only members could bring disputes: If a non-member was attacked, the League could not act unless the member brought the issue. The League's jurisdiction was limited.
4. No enforcement power: The League could pass resolutions, impose sanctions, and condemn aggression — but it had no way to enforce its decisions. Aggressors knew they could ignore the League with impunity.
5. Dependence on great powers: The League was only as strong as its strongest members. When Britain and France (the leading powers) chose appeasement over confrontation, the League was powerless.

10.2 Political Weaknesses

1. US absence: The world's strongest economic and military power stayed out. US membership would have given the League economic weight (sanctions would hurt much more with US participation) and military credibility.
2. Self-interest of members: Member states, especially Britain and France, prioritised their own national interests over collective security. They were not willing to risk their own armies to defend distant countries.
3. Treaty of Versailles resentment: The League was seen by many (especially Germany) as a "club of the victors" — it was created to enforce the hated Treaty of Versailles, not to create a just world order. This undermined its moral authority.

10.3 The League's Major Failures — Case Studies

10.4 Why the League Failed — Summary

1. Absence of major powers: USA never joined. Germany and USSR joined late and left early. Japan and Italy left. The League lost its most influential members.
2. No military force: The League could only recommend — not enforce. Economic sanctions were slow and ineffective (as seen in Abyssinia).
3. Unanimity requirement: Any member could veto action. The League could rarely agree on effective measures.
4. Weak leadership (Britain and France): The League's leading powers were war-weary, economically struggling, and unwilling to use force. They chose appeasement over collective security.
5. League seen as a "club of victors": It was created by the victorious powers to enforce the Versailles settlement — not as an impartial peacekeeper. This undermined its moral authority.
6. Great Depression (1929): The global economic crisis made countries focus on domestic problems, not international cooperation. Nations became more nationalistic and less willing to cooperate through the League.
7. Failure of disarmament: Article 8 of the Covenant promised disarmament. The World Disarmament Conference (1932-34) failed completely. Germany withdrew. The arms race continued.

10.5 Legacy — From the League of Nations to the United Nations

• The League was officially dissolved on 18 April 1946 — its assets and functions were transferred to the newly created United Nations.
• The UN learned from the League's failures: (a) The UN has a military force (peacekeeping troops contributed by member states), (b) The Security Council has binding resolutions (Chapter VII), (c) The US joined the UN, (d) Decisions require only 9/15 votes in the Security Council (though P5 veto still exists).
• Many League agencies were transferred to the UN (ILO, UNESCO's predecessor, Health Organization, etc.).
• The League's greatest legacy was proving that international peacekeeping organisations needed real power, universal membership, and the ability to enforce decisions — lessons that shaped the UN.

11. Previous Year Questions (PYQs) — ICSE Board

2-Mark / 3-Mark Questions:

1. What is meant by the term "Militarism"? How did it contribute to WWI?
2. Name the two alliance systems in Europe before WWI. Which countries were in each?
3. What was the immediate cause of the First World War?
4. Who assassinated Archduke Franz Ferdinand? Where and when did this happen?
5. What was the "Blank Cheque" given by Germany to Austria-Hungary?
6. Why did the USA enter the First World War in 1917? Give any two reasons.
7. What was the Zimmermann Telegram? Why did it anger the USA?
8. What was the significance of the sinking of the Lusitania?
9. Name the four empires that collapsed after WWI.
10. What was the War Guilt Clause (Article 231) in the Treaty of Versailles?
11. Why did Germany resent the Treaty of Versailles? Give two reasons.
12. What were the main military restrictions imposed on Germany by the Treaty of Versailles?
13. What was the Treaty of Sèvres? With which country was it signed?
14. Why was the Treaty of Sèvres replaced by the Treaty of Lausanne (1923)?
15. When and where was the League of Nations founded? Who proposed its creation?
16. Name the main organs of the League of Nations.
17. Why did the USA never join the League of Nations?
18. What was the Manchurian Crisis (1931)? How did the League respond?
19. What was the Hoare-Laval Pact? Why was it significant?
20. Why did the League of Nations fail to stop Italy's invasion of Abyssinia (1935)?

5-Mark / 8-Mark Questions:

1. Explain the causes of the First World War under the heads: Militarism, Alliances, Imperialism, and Nationalism.
2. Describe the immediate cause of the First World War. How did the assassination at Sarajevo lead to the outbreak of war?
3. Explain the role of the alliance system in turning a local conflict into a world war.
4. Describe the factors that led to the USA's entry into WWI in 1917. Why was US entry a turning point?
5. Explain the main results / consequences of the First World War.
6. Describe the terms of the Treaty of Versailles under the heads: Territorial, Military, Financial, and War Guilt.
7. Why did the Treaty of Versailles cause resentment in Germany? How did this connect to the rise of Hitler?
8. What was the Treaty of Sèvres (1920)? Why did it fail, and what replaced it?
9. Describe the formation, structure, and aims of the League of Nations.
10. Explain the reasons for the failure of the League of Nations to maintain world peace. Use examples.
11. Discuss the role of the League of Nations in the Manchurian Crisis (1931) and the Abyssinian Crisis (1935). Why did it fail in both?
12. Compare the Treaty of Versailles and the Treaty of Sèvres. How were they similar and different?
13. "The League of Nations was a noble idea that failed because of its own weaknesses." Explain this statement.