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Austria
Austria took over, Bosnia and Herzegovina, two areas with large Slavic populations
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Serbia assassin
Gavrilo Princip (19) killed Archduke Franz Ferdinand. This led to Germany declaring war on Russia -
Germany declares war
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Great Britain declares war on Germany
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France invades Alsace
This was the opening attack of World War I by the French Army v.s. Germany -
United States enters war
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Russia became part of the Union of Soviet Socialist Republics