Answer:
Many countries wanted to be the most powerful, such as Britain with their elite Navy at the time. This and many other countries advance in technology such as Germanys U-Boats and America's incredible guns being sold to both the Triple Alliance and Triple Entente lead to the War (Note, America stopped selling guns to Germany before America joined in because of the sinking of the USS Lusitania and what Germany had done to Belgium to get to France.)
Step-by-step explanation: