Summarize all events where the League of Nations failed to prevent war.

The League of Nations was an international diplomatic group developed after World War I as a way to solve disputes between countries before they erupted into open warfare. The League effectively ceased operations during World War II.

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".

there is no photo, therefore i can not answer your question.