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European countries became suspicious of each other. They formed two alliances: Triple alliance and Triple Entente
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All the great powers were competing for colonies.
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The two Balkan wars: in the first one, Serbia, Bulgaria, Greece and Montenegro defeated the Ottoman empire. In the second, Bulgaria and Serbia fought for dominance in the region, and Serbia emerged as the victor.
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Paced Armed, in each country tried to have a better military machine than their enemy, spending huge amounts of money on manufacturing new weapons.
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Armed peace in each country tried to have a better military machine than their enemy, spending huge amounts of money on manufacturing new weapons.