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One side, the allies had Great Britain, France and Russia and the other side had Germany, Austria-Hungary, and Ottoman. Japan was a rival of Germany and joined the Allies in August
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Franz Ferdinand and his wife assassinated and World War 1 begins.
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Deadly weapons introduced by German in April, poison gas against allied troops, the gas could kill or seriously injure anyone who inhaled it.
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A German U-boat torpedo the British liner, called the Lusitania near Ireland, more than 1,000 killed.
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To break the standstill of the war both launched major offensives
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Germans attacked and sank four American merchant ships, thirty-six people were killed in this attack.
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Some French troops refused to continue fighting, British were running low on war supplies and food.
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In May John J Pershing became supreme commander of what was called the American Expeditionary Force. General Pershing led American forces in Europe and received a hero's welcome.
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President Wilson decided the the United States could not stay neutral, he asked congress for a declaration of war against Germany. The Congress decided it must defend it's rights if it wished to remain a world power.
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In march Lenin signed the treaty of Brest-Litovsk with Germany
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In October, Poland, Hungary, and Czechoslovakia declared independence, by early November the governments of Austria-Hungary and Ottoman Empire surrendered to the Allied powers.
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On November 11, at the 11th hour, on the 11th day of the 11th month.Germany agreed to withdraw all land forces west of Rhine River. Guns were silent and fighting stopped. What had been called the great war was over.