How would i briefly sum up the cause of World War One in one paragraph?

Causes include:

I really do not like this messaging system. Causes include: Militarism (the arms race) Imperialism The division into alliances - the triple entente and the central powers Aftermath of the Franco-Prussian War - animosity between France and a newly-strengthened Germany Nationalism (in the Balkans - Ferdinand's assasssination being the short-term trigger) The key ones are imperialism, militarism and, in the short term, the situation in the Balkans.