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NATIONALISM
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ALLIANCES
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European countries formed two alliances: Triple alliance and triple entente
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IMPERIALISM
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All great powers were competing for colonies
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Two Balkan wars: In the first side are Serbia, Bulgaria, Greece and Montenegro defeat Ottoman empire. In the second, Bulgaria and Serbia fought for dominance in region, and Serbia emerged as the victor.
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MILITARISM
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Armed peace tried to have a better military machine than the enemy and spending a lot of money on manufacturing new weapons.