There were many lingua francas of which French was supposedly the first global lingua franca. That changed and it became English (from what I understand). We will probably see another language become the lingua franca, so my question is: should it be English? Are there better candidates out there? Why / why not?
I think that what started that snowball rolling was the Seven Years War. That started the Brits on the path of being the bigger global empire.
https://en.wikipedia.org/wiki/Seven_Years'_War