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The Treaty of Versailles was the primary agreement produced by the Paris Peace Conference. It was signed by the Allied and associated powers and by Germany. This ended WWI, but then started WWII.

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In a speech before Congress, President Wilson laid out his "14 Points" which was an ambitious blueprint to end WWI. The Germans rejected Wilson's 14 Points immediately out of hand, because they thought they could still win the war.

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The Zimmerman Telegraph is a secret diplomatic communication issued from a German Foreign Office. It introduced a military alliance between the German Empire and Mexico if the U.S. has entered WWI against Germany. This also forced America to join the war.

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This battle was the longest and bloodiest battle in WWI, in which the French repulsed a major German offensive. The Germans hoped that the French would suffer millions of losses at a little cost.

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The Lusitania was torpedoed by an Imperial German Navy U-Boat, because the Germans had felt themselves fully justified in attacking a vessel that was furthering the war. The result of the amount of American deaths angered the U.S. (123 Americans)

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The Schlieffen Plan has established that, in case of the outbreak of war, Germany would attack France first, than Russia. This was first proposed on 1905 for a warning. Now they had a chance to use it.

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Germany had demanded France to remain neutral, and for the Russians to stop mobilizing. Neither of the countries answered Germany's demands. When Germany declared war on Russia, France knew Germany would eventually declare war on them. Soon enough, France was right.

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This happened when Russia was preparing for war. Russia had refused to back down when Germany warned it to stop mobilizing for war, so that's when Germany decided to declare war.

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Austria-Hungary's declaration of war on Serbia marked the beginning of WWI and was one of the world's most tragic conflicts in the history of the human race. This happened to punish Serbia and to quash support for Serbian Nationalism.

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Archduke, Franz Ferdinand, was assassinated by Gavrilo Princip in Sarajevo. The assassination team was helped by something called, "The Black Hand" which was a Serbian secret nationalist group. Not only was Franz assassinated, but his wife was assassinated also, because of the assassin's bullets. This incident led to the outbreak of WWI