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Between 1870 and 1914, the size of both Germany's and France's armies doubled due to fear of attack from nearby countries. Other countries used new weapons to defend themselves too.

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Assassination of Archduke Franz Ferdinand - Archduke Franz Ferdinand was assassinated by a Bosnian spy in Sarajevo in 1914. This was the breaking point that started WW1.

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48 hours after the assassination of Archduke Franz Ferdinand, Austria-Hungary declared war on Serbia, which caused many other European countries to go to war.

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Nationalism was high in Serbia and Bosnia, south of Austria-Hungary, when a large Slavic population that lived between those nations desired their own nation with pride to be free from Austria-Hungary's control. These nationalistic feelings led to the actual event that sparked WW1.

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As the war started, there was one side - the Allies, and the other side - the Central Powers. The Central powers were trying to cease power, while the allied powers were trying to stop the central powers and were more focused on justice than what they could gain.

Allied: Great Britain, France, Russia, Serbia, and Belgium.

Central Powers: Austria-Hungary, Germany, and the Ottoman Empire.

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Many small countries joined the war in pursuit of power, money, glory, and land. They believed if their side won the war, they would take control of land owned by countries on the other side and claim the natural resources for themselves.

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The Treaty of Versailles was the treaty that ended WW1. It blamed Germany for WW1 and took land, money, and military from them. The U.K. and U.S. leaders were against it but other allied leaders overruled their warnings. It was signed in Versailles, France.

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The Treaty of Versailles caused anger in Germany. They were forbidden to join forces with Austria and this made them feel like the Allies were telling them who to be friends with. This caused much tension in Europe and eventually, it led to WW2.