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Austria-Hungry declares war with Serbia. Archduke Ferdinand and his wife gets killed by a Serbian nationalist. Austria asks Germany to join war against Serbia.
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Russia decided to support Serbia, But Germany said they would declare war on Russia if Russia interfered. Germany declared war on Russia. Making a alliance with Austria, Germany mad a double alliance war.
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Britain and France declare war on Germany. Germany had troops in Poland to attack France. Britain demanded for removal but Germany ignored it. Britain and France declared war.
