When would fit the answer
Hope this helps
as according to https://en.wikipedia.org/wiki/American_entry_into_World_War_I
The U.S. was trying to not enter WW1 for at least 2 years
The Assassination of Archduke Franz Ferdinand
I would suggest you start by matching countries to the cities you recognize. For example, Rome is in Italy, which means that "Italy" is N. If you are unsure about others, I'm sure you can google a map of Europe and that will help you fill out the rest :)
