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Austria-Hungary invades Bosnia and declares an annexation to have access to the sea.
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Bosnia had to become separated from Serbia after being invaded by Austria-Hungary. The Serbian people that lived in Bosnia were against the invasion and started forming terrorist groups.
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The Black Hand was a terrorist group from Serbia that was created after Austria-Hungary invaded Bosnia.
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Seven terrorists from the Black Hand , lead by Gavrilo Princip, planned the murder of the Archiduke. They failed in their first attempt. In an accidental encounter, Gavrilo found and shot him and a wife.
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War was declared on Serbia by Austria-Hungary.
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Germany becomes allies with Austria-Hungary. Russia and Serbia become allies. Germany declares war on Russia.
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France declares war on Germany. Germany decided to invade Belgium.
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Great Britain joins the triple Entente and declares war on Germany.
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Italy joins the triple alliance and World War I officially begins.