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The Black Hand were formed and started movement against Austria-Hungary.
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They decied how they will use their wapons and what would be the best way.
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The Black Hand let a bomb explode during Franz Ferdinand was driving with his wife through Sarajevo, but the bomb failed.
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Franz Ferdinand and his wife were visiting the persons who were injuried by the bomb. By visting Franz Ferdinand and his wife were killed by a shooting.
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Since Austria-Hungary declared war on Serbia, everything is going to start.
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Germany is getting ready with the army to support Austria-Hungary in the war. It has also to expect that Russia is going to become active in the war.
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Russia was with Serbia allied and Austria-Hungary with Germany. That means when Austria-Hungary declared war on Serbia.Russia and Germany would support their partners.
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That was the date of the final end of the world war 1.