Order in number the events that started World War I.

Question

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.

Choices:
1
2
3
4
5
6
7

Answer 1

1. Austria issued ultimatum to Serbia after Archduke's assassination.
2. Serbia rejects ultimatum and Austria declares war.
3. Russia mobilizes against Austria.
4. Germany declares war on France and Russia.
5. Other European nations line up with Central Powers or Allied Powers.
6. Italy signs secret treaty with Great Britain and joins the Allied Powers.
7. Great Britain reluctantly enters war after Germans violate Belgian neutrality.