World Wars (I & II)

Overview

World Wars Overview	Global shifts in power, collapse of empires, and birth of United Nations. Key milestones include 1914 (WWI) to 1919 (Versailles) to 1939 (WWII) to 1945 (Atomic age/UN).

1. World War I Details

Structural Causes (MAIN)	Militarism, Alliances (Triple Entente vs Triple Alliance), Imperialist rivalries, aggressive Nationalism. Sparked by assassination of Archduke Franz Ferdinand in Sarajevo.
Treaty of Versailles (1919)	Imposed harsh, dictated peace ("Diktat") on Germany. Article 231 (War Guilt Clause) forced Germany to accept sole responsibility for war. Imposed crippling financial reparations, demilitarized Rhineland, and partitioned German colonies.
League of Nations	Established in 1920 to maintain collective security. Ultimately failed because it lacked military force, required unanimity for decisions, and USA refused to join.

2. World War II Details

Triggers & Alliances	Caused by German/Japanese expansionism, failure of League of Nations, and Western appeasement. Immediate trigger was German invasion of Poland on 1 September 1939. Axis Powers (Germany, Italy, Japan) fought Allied Powers (UK, US, USSR, China).
Battle of Stalingrad (1942–43)	Decisive turning point on Eastern Front, breaking German army.
Battle of Midway (1942)	Turning point in Pacific, breaking Japanese naval supremacy.
End & Aftermath	Concluded after US dropped atomic bombs on Hiroshima and Nagasaki in August 1945. Led to establishment of United Nations (1945)—featuring Security Council where P5 hold veto power—and ushered in Cold War.

3. India's Role & Impact

World War I Contribution	India contributed 1.5 million soldiers fighting in France, East Africa, Mesopotamia, and Gallipoli. Economically suffered inflation and tax burdens, fueling Home Rule League, Rowlatt Act protests, and Gandhi's non-cooperation movement.
World War II Military Contribution	India raised 2.5 million soldiers (largest volunteer army in history), fighting in North Africa (El Alamein), Italy (Monte Cassino), and Burma.
World War II Scientific & Political Impact	Indian scientist K. Sitaramaiah developed special anti-freezing lubricants for tanks, crucial for Soviet operations at Battle of Kursk (1943). Triggered Quit India Movement (1942) and formation of INA by Subhas Chandra Bose. Caused catastrophic Bengal Famine of 1943 (3+ million deaths).

4. Post-War Consequences & Traps

Decolonization	Accelerated by economic exhaustion of European colonial powers (leading to Indian independence in 1947).
Bipolarity & Nuclear Era	Divided world into US and Soviet spheres (Cold War). Nuclear age led to "nuclear apartheid" (NPT regime), to which India responded with No-First-Use (NFU) doctrine.
US Entry Timing	USA was neutral at start of both wars, entering WWI in 1917 and WWII in 1941 (post-Pearl Harbor).
Japan's Alliance Shift	Japan fought with Allies in WWI (gaining German concessions in China) but was an Axis power in WWII.