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- France
- Britain
- Russia (briefly)
- the United States (later/briefly)

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- Germany
- Austria-Hungary
- the Ottoman Empire
- Italy (briefly)

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- Archduke Franz Ferdinand of Austria-Hungary is assassinated in Sarajevo, Bosnia in 1914 by Serbian nationalist Gavrilo Princip

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nations began to expand and build up their armies, (seemingly unprovoked) causing suspicion among neighboring countries

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countries began to form alliances with each other, causing more suspicious and the creation of even more alliances

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national pride becomes threatening and oppressive, creating tension and hostility within empires

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the conquering of nations for resources or simply to expand empires

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the assassination of Archduke Franz Ferdinand of
Austria-Hungary

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- Russia was drawn into the war to protect its Serbian allies, but was in the middle of a revolution and pulled out of the war in 1915.

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-in 1915, the RMS Lusitania is sunk by German U-Boats
-later, in 1917, Germany sends out the Zimmerman Telegram, which secretly offered Mexico American land in return for an alliance
- the telegram is intercepted by American forces and President Woodrow Wilson declares war on Germany

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-the French army was the largest in the Triple Entente, allowing them to offer assistance to other troops, such as Great Britain and the United States
-France also took the most damage with over 1 million casualties

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- after the sinking of the American Lusitania, Germany attempts to secretly contact Mexico, promising the return of the land they'd lost in the Mexican-American War
- America intercepts the message and declares war in 1915
- Germany continued their heavy usage of the U-Boats, sinking the British ship, The Arabic, and an additional 5 American ships
- at the end of the war, the Treaty of Versailles forced Germany to give up its gained territories in Belgium, Poland, and Czechoslovakia and return Alsace-Lorraine to France, and give up its overseas colonies. the treaty also required Germany to reduce its military

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- declares war on Serbia after the Assassination of Archduke Franz Ferdinand by Gavrilo Princip
-quickly gathered allies of smaller nations, which brought lager nations with them for extra protection in the event of a war

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-attacks Russia in 1914, enters the war by 1915
-serves as aid to Austria-Hungary

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-initially enters the war on the side of the Triple Alliance, later switches over to the Triple Entente in promise of new territory