What factors contribute to the start of world war 1 in europe

The war, which began in Central Europe at the end of July 1914, included interrelated factors, such as conflict and hostility from the four transitions Facing the war. Militarism, alliance, imperialism, and nationalism also play a major role in this conflict.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

where is the passage

i cant solve it without knowing the passage