What was the main cause of world war 1

To be honest there could be many qualified answers to this question.  With that being said I believe the cause was due to the difference in policies. Militarism, Alliances, Imperialism and Nationalism were all scatter around the globe  and quickly problems arises from those.

World War 1 started when Archduke Franz Ferdinand of Austria was assassinated on June 28, 1914. This was the immediate cause but there were a series of events which triggered the war. See below for more information and facts about how World War 1 started.

Brainliest please?

the indians crossed artificial boundaries, setting the stage for conflict

is there multiple