Answer:
Step-by-step explanation:
The main causes of World War I are (alliances, imperialism, militarism, nationalism) and the assassination of Archduke Franz Ferdinand of Austria-Hungary.
1.Secret alliances were formed prior to the outbreak of the war. After the Assassination of Franz Ferdinand the Archduke of Austria-Hungary the alliance systems went into effect leading to many nations protecting one another
2.The expansion of European nations as empires (Imperialism) can be seen as cause of World War I, because as countries like Britain and France expanded their empires, it resulted in increased tensions among European countries.
3.Militarism could have been the cause of the war due to the naval and arms race. The main event of Militarism causing World War 1 was the naval rivalry which was made after 1900.While Britain and Germany built up their navies, the major powers on mainland Europe were also building up their armies
4.The direct way nationalism caused World War I was through the assassination of Archduke Franz Ferdinand, who was the heir to the throne of the Austro-Hungarian Empire. Many oppressed Slavic groups in the Austro-Hungarian Empire wanted to form independent nation states.
Hope this helped!!!