Synthesize the influence factors of the "Gunpowder Empires" to develop

What was the final spark that ignited the “european powder keg” and started world war 1

Can someone me out with this , i'm putting 30 points on it

Which of the following is not true about isaac stevens, the first territorial governor of washngton a he was friends with the president franklin pierce b he graduated first in his class at west point academy che served in the mexican-american war he reluctantly accepted the job as governor