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The Main Cause
Archduke Franz Ferdinand, prince to the Austria-Hungary throne, is assassinated in Sarajevo by a Serbian named Gavrilo Princip -
Declaring wars
Austria-Hungary declares war on Serbia. Russia begins mobilizing its troops. -
Declaring wars
Germany declares war on Russia. -
Declaring wars
Germany declares war on France as part of the Schlieffen Plan. -
Declaring wars
Germany invades Belgium. Britain declares war on Germany.