
Serb Nationalism: Napoleon Bonaparte and the Rise of Nationalist Sentiment Napoleon Bonaparte and the Rise of Nationalist Sentiment.Long-term Causes: Why did the war break out? The results of World War I would be important factors in the development of world war II 21 years later. World War I created a decisive break with the old world order that had emerged after the Napoleonic Wars, which was modified by the mid-19th century’s nationalistic revolutions. It was a total War which left great devastation, millions dead and shaped the modern world.


