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Nationalism encouraged newly united nations such as Italy and Germany to show their power. Their actions threatened older nations, Great Britain and France.
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People of Sarajevo,Bosnia crowded the streets while Franz Ferdinand and his wife were sitting on and by the thrown. They were in town for a visit. As they rolled along in their open car, that's when the gunman attacked. Both him and his wife died.
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Eruopean powers strengthened their armies and navies. When one nation increased, the rival got mad and built up theirs too.