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These groups hoped to drive Austria-Hungary from the Balkans and establish a 'Greater Serbia', a unified state for all Slavic people. It was this pan-Slavic nationalism that inspired the assassination of Archduke Franz Ferdinand in Sarajevo in June 1914, an event that led directly to the outbreak of World War I.

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It caused the war because Austria blamed Serbia for the killing of the Archduke Franz Ferdinand. ... I think the most significant cause of World War one was the assassination of the Archduke Franz Ferdinand. The other causes of the war was Imperialism, Militarism, Nationalism and Alliances that were formed.

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Britain
Great Britain stood alongside Spain, Portugal, the Dutch Republic, and France, just as one of the five European colonial powers.
The British Empire took place in India, South Africa, Australia, New Zealand, Canada, Hong Kong, Egypt, parts of North Africa, islands in the Pacific and Caribbean, and concessions in China.
Britain was one of the most expanded empires in WW1 therefore it’s one of the most important and powerful countries during WW1.

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The assassination of Archduke Franz Ferdinand in Sarajevo on 28th June 1914, it triggered a chain of events that resulted in World War 1. After the assassination, Austria-Hungary threatened war on Serbia.

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If a country is taken over, for example France taking over Morocco, their allies would help them seek independence. The result of this is countries becoming enemies and forming different allies. Subsequently multiple countries would attack each other, which would cause war.

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Russia had lots of weapons such as dreadnoughts and were threatening towards most countries so naturally they made friends