1. Archduke's assassination
2. Austria issued ultimatum to Serbia
3. Austria declared war on Serbia after Serbia rejects ultimatum
4. Russia mobilized against Austria
5. Germany declared war on France and Russia
6. Other European nations line up with Central Powers or Allied Powers
7. Great Britain reluctantly enters war after Germans violate Belgian neutrality
8. Italy signs secret treaty with Great Britain and joins the Allied Powers
Order in number the events that started World War I.
Austria declared war on Serbia after Serbia rejects ultimatum.
Russia mobilized against Austria.
Italy signs secret treaty with Great Britain and joins the Allied Powers.
Great Britain reluctantly enters war after Germans violate Belgian neutrality.
Austria issued ultimatum to Serbia after Archduke's assassination.
Other European nations line up with Central Powers or Allied Powers.
Germany declared war on France and Russia.
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