What forces contributed to outbreak of WWI and how? World War I is different from most other wars in that it was not a direct result of aggression by one e

What forces contributed to outbreak of WWI and how? World War I is different from most
other wars in that it was not a direct result of aggression by one
entity towards another, notwithstanding the assassination of Austrian
Archduke Franz Ferdinand by Serbian elements. Instead, it was a
consequence of a number of forces amidst a disruption of the tenuous
balance of power in Europe. What were these forces and how did they
contribute to the outbreak of WWI?
Brower, D., & Sanders, T. (2014). The world in the twentieth century: From empires to nations (7th ed.). Boston, MA: Pearson.