Key events, alliances, and turning points of World War I, World War II, and the Cold War in global context. Front: the term, event, or figure. Back: a one to two sentence explanation of its significance.
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- Assassination of Archduke Franz Ferdinand
- The 1914 murder of Austria-Hungary's heir in Sarajevo by a Serbian nationalist triggered the July Crisis and set off the chain of alliances leading to World War I.
- Triple Alliance
- The military pact between Germany, Austria-Hungary, and Italy, formed in 1882 to counter French-Russian cooperation and create a balance of power in Europe.
- Triple Entente
- The alliance of France, Russia, and Britain formed between 1894 and 1907 to counterbalance the Triple Alliance and maintain European balance of power.
- Schlieffen Plan
- Germany's military strategy to avoid a two-front war by rapidly defeating France through Belgium before turning to fight Russia, which ultimately failed due to Belgian and British resistance.
- Trench warfare
- A defensive military tactic of digging fortified trenches where soldiers could resist attacks, dominating the Western Front and resulting in massive casualties with minimal territorial gain.
- Battle of the Somme
- A 1916 British-French offensive on the Western Front that resulted in over one million casualties with minimal strategic gains, symbolizing the horrific cost of trench warfare.
- Battle of Verdun
- A 1916 German-French battle lasting ten months and causing 700,000 casualties in a brutal test of attrition on the Western Front, won by France but at devastating cost.
- Gallipoli Campaign
- An Allied attempt in 1915 to create a new front against the Ottoman Empire in Turkey that failed disastrously, resulting in high casualties and strategic withdrawal.
- Russian Revolution of 1917
- The overthrow of the Russian Tsar and takeover by Bolsheviks under Lenin, leading to Russia's exit from World War I and the creation of the Soviet Union.
- Treaty of Versailles
- The 1919 peace treaty ending World War I that imposed harsh terms on Germany including reparations, territorial losses, and military restrictions, creating resentment that fueled later conflict.
- United States entry into World War I
- America entered the war in 1917 following the Lusitania sinking and the Zimmermann Telegram, providing critical military and economic resources that helped turn the tide against Germany.
- Adolf Hitler's rise to power
- Hitler's Nazi Party gained popularity in 1930s Germany through promises to restore national pride and overturn the Versailles Treaty, leading to his appointment as Chancellor in 1933 and establishment of totalitarian rule.
- Appeasement policy
- Britain and France's strategy of making concessions to Hitler's Germany to avoid war, including accepting German rearmament and the remilitarization of the Rhineland, which ultimately emboldened Nazi aggression.
- German invasion of Poland
- Germany's September 1939 invasion of Poland using blitzkrieg tactics prompted Britain and France to declare war, officially marking the start of World War II in Europe.
- Blitzkrieg
- A German military strategy combining rapid armor and air attacks to quickly overwhelm defenses, used successfully against Poland and France but failed in the Soviet Union where geography favored defense.