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Event Description: The heir to the Austro-Hungarian throne, Archduke Franz Ferdinand, was assassinated in Sarajevo by Gavrilo Princip, a Bosnian Serb nationalist. Outcome: The assassination led to Austria-Hungary declaring war on Serbia, which in turn triggered the alliance system leading to World War I.

Event Description: World War I began when Austria-Hungary declared war on Serbia, after the assassination of Archduke Franz Ferdinand. Outcome: The war quickly escalated as more nations joined due to alliances, marking the beginning of a global conflict.

Event Description: The Battle of the Marne was the first major battle of World War I where the Allies successfully repelled the German advance on Paris. Outcome: The battle effectively ended the Schlieffen Plan and resulted in the establishment of trench warfare.

Event Description: Poison gas was first used as a chemical weapon by the German Army at the Second Battle of Ypres. Outcome: The use of chemical warfare introduced a new, brutal dimension to the conflict and led to future development of gas masks.

Event Description: The Battle of Verdun was one of the longest and most brutal battles in World War I, fought between the French and German armies. Outcome: The battle resulted in massive casualties on both sides and became a symbol of French determination.

Event Description: The Battle of the Somme was marked by significant loss of life and little territorial gain for the Allies. Outcome: The battle became a symbol of the futility of trench warfare and the high casualty rates of World War I.

Event Description: The United States joined World War I on the side of the Allies after a series of provocations, including the sinking of the Lusitania and the Zimmermann Telegram. Outcome: The entry of the U.S. provided a significant boost to the Allied resources and morale.

Event Description: The Russian Revolution led to the overthrow of the Tsar and the rise of the Soviet Union. Outcome: Russia's withdrawal from World War I after the Bolsheviks seized power, which allowed Germany to move troops from the Eastern to Western Front.

Event Description: Also known as the Third Battle of Ypres, it was marked by heavy rain, mud, and massive casualties. Outcome: The battle gained little ground for the Allies and highlighted the horrific conditions of trench warfare.

Event Description: World War I ended with the signing of the Armistice of Compiègne between the Allies and Germany. Outcome: The armistice marked the cessation of hostilities on the Western Front, which took effect at the 11th hour of the 11th day of the 11th month.

Event Description: The Treaty of Versailles was the peace treaty that officially ended World War I and imposed heavy reparations and territorial losses on Germany. Outcome: The treaty's harsh terms and the sense of humiliation it caused in Germany contributed to the rise of Nazi Germany and WWII.

Event Description: The British ocean liner RMS Lusitania was sunk by a German U-boat, resulting in the deaths of many civilians, including Americans. Outcome: The sinking significantly turned public opinion in Allied countries against Germany and edged the U.S. closer to entering the war.

Event Description: The Gallipoli Campaign was an unsuccessful attempt by the Allied Powers to control the sea route from Europe to Russia. Outcome: The campaign resulted in heavy casualties and is considered one of the Allies' greatest failures.

Event Description: The Second Battle of the Marne was the last major German offensive on the Western Front. Outcome: The battle was a decisive victory for the Allies and marked the turning point of the war in their favor.

Event Description: Germany's Spring Offensive was a series of German attacks along the Western Front. Outcome: The offensive initially achieved significant gains but ultimately failed to break through Allied lines, leading to German exhaustion.

Event Description: The Battle of Jutland was the largest naval battle of World War I, fought primarily between the British Royal Navy's Grand Fleet and the Imperial German Navy's High Seas Fleet. Outcome: The battle was tactically inconclusive but strategically it reinforced the British naval blockade of Germany.

Event Description: A deadly influenza pandemic, dubbed the Spanish Flu, spread worldwide during the final year of WWI. Outcome: The pandemic killed millions and impacted troop movements and economies, adding to the war's disruptions.

Event Description: The First Battle of the Marne was a critical battle where the Allies halted the advance of the German army near Paris. Outcome: The battle saved Paris from capture and forced the Germans to retreat, leading to a stalemate and trench warfare.

Event Description: The Sykes-Picot Agreement was a secret treaty between the UK and France, with Russia's assent, to divide the Ottoman Empire's territory in the Middle East. Outcome: The agreement laid the foundations for the modern political landscape of the Middle East and caused resentment when it was later revealed.