Map of World with Participants in World War I : Allies- in green
Central Powers- in orange Neutral- in grey The triggering event
cause of World War I was the assassination of Archduke Franz
Ferdinand, heir to the Austro-Hungarian throne, in 1914. The
fact that the assassination did not lead to a war of two
nations, but a war among many nations around the whole world,
has to do with the alliance system in the era. Although the
actual causes of the war are complicated, the escalation of the
size of the war can be partly attributed to the alliance
treaties. For the readers’ convenience, some of the entrances of
the participants will be listed below: 1. Austria-Hungary-
declared war on Serbia due to the assassination. 2. Serbia-
became a participant by Austria-Hungary’s war declaration. 3.
Russia- allied to Serbia by their treaty 4. Germany- allied to
Austria-Hungary by their treaty 5. France- allied to Russia 6.
Britain- allied to France. Since Britain has entered the war,
her many colonies have became participa