You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who started the war in world war 1?" whose answer is Gavrilo Princip.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who started world war 1
Useful Output:

Doc 1: Growing tensions between the great powers and in the Balkans reached a breaking point on 28 June 1914, when Gavrilo Princip, a Bosnian Serb, assassinated the
Doc 2: On 28 June 1914, a Bosnian nationalist, Gavrilo Princip, killed Archduke Franz Ferdinand, heir to the Austro-Hungarian throne, and his wife Sophie.
Doc 3: The Allies — the British Empire, France, Belgium, Russia and later, the USA — were in one family. And the Central Powers of Germany, Austria, Hungary, Bulgaria
Doc 4: The Great War began on June 28, 1914, with the assassinations of Austrian Archduke Franz Ferdinand and his wife, Sophie, while they were visiting Sarajevo,
Doc 5: The war was started by the leaders of Germany and Austria-Hungary. Vienna seized the opportunity presented by the assassination of the archduke