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Serbia and other Balkan nations gain independence from the Ottoman Empire, very nationalistic. Serbia was viewed as suspicious. Serbia alienated their own minorities to grow as a country.
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King Alexander and Queen Draga were mutilated. Dragutin Dimitrijevic (founding member and leader of the black hand) ordered the queen and kings assassination. The Black Hand was a terrorist organization.
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Made the decision to annex Bosnia and Herzegovina (Both part of the Ottoman Empire). This enraged many regions especially the Ottoman Empire.
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England, France and Russia. Germany and the Ottoman Empire. Concerned about another Balkan explosion.
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Russia now controlled the Bosporus, and Italy retained Tripoli and Cyrenaica
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Kaizer wanting to drive a wedge between Germany and England. Resulted in France taking over Morocco.
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Germany made a big mistake by building a navy made to challenge Great Britain. This causes a "competition" between two countries about building a greater navy.
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Used terrorist methods to promote the liberation of Serbs outside Serbia from Habsburg or Ottoman rule and was instrumental in planning the assassination of the Austrian archduke Franz Ferdinand.
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Ignited the fire to start the WW1
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Tanks, Diesel Fuel, Bombers and Fighter Jets, other large planes.