Increasing diplomatic tensions between the European great powers reached a breaking point on 28 June 1914, when a Bosnian Serb named Gavrilo Princip ...
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What started World War I?
The spark that set off World War I came on June 28, 1914, when a young Serbian patriot shot and killed Archduke Franz Ferdinand, the heir to the Austro-Hungarian Empire (Austria), in the city of Sarajevo. The assassin was a supporter of the Kingdom of Serbia, and within a month the Austrian army invaded Serbia.
Why did the U.S. enter WW1?
Germany's resumption of submarine attacks on passenger and merchant ships in 1917 became the primary motivation behind Wilson's decision to lead the United States into World War I.
Why did Germany start WW1?
The German government believed that the onset of war and its support of Austria-Hungary was a way to secure its place as a leading power, which was supported by public nationalism and further united it behind the monarchy.
What was the main cause of the World War 1?
The main causes of World War 1 were alliances between countries, militarism, nationalism, imperialism, secret diplomacy, and internationalism. The assassination of Archduke Franz Ferdinand, heir to the throne of Austria-Hungary, by Gavrilo Princip in Bosnia is widely accepted as the starting point for World War I.
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World War I pitted Germany, Austria-Hungary and the Ottoman Empire against Great Britain, the United States, France, Russia, Italy and Japan.