Depends on your level of abstraction, I guess. GP stated "We all speak English because at one point the English practically owned the entire planet."
Which in our case is false. We stopped learning German as a second language because of the Nazi aggression and atrocities during WW2, and started learning English as a second language due to their aid and closer relations during the war.
But yes, it's obviously not because of any linguistic merit.
It would help if we knew which country. Was this due to (1) pre-WW2 German language mostly useful for trade with Germany, or (2) a significant minority of ethnic Germans, who probably returned to Germany (E/W) after WW2? My guess: #2.