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In June of 1914, Archduke and his pregnant wife Sophie were both assassinated in the streets of Sarajevo.
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Austria-Hungary was dissatisfied with Serbia's response to their ultimatum, so they decided to declare war on Serbia.
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They had a treaty from Serbia to come and help their aids in the war. They also began to mobilize their troops which took 6 weeks.
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Germany viewed the Russian mobilization as an act of war against Austria-Hungary, with whom Germany had a treaty with.
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France had a treaty with Russia, and soon found themselves fighting against Germany.
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Great Britain had a treaty with France to come to their aid. Also, the invasion of Belgium arose tension.
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They all entered WW1 after Britain. They offered military and financial assistance to Britain during the war.
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Japan had a military agreement with Great Britain, which forced them to join war and fight Germany.
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Italy didn't find Germany's acts defensive and wanted to remain neutral. They decided to enter war on the allies side.
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Even though trying to remain neutral, the sinking of the Lusitania and the Zimmerman note was enough to push them over the edge.