"The most deadly event in recorder history" apparently you are not very familiar with recorded history. Incidentally, Great Depression allowed a certain populist guy to come to power in a European country and to unleash an event that was several times more deadly. I guess he didn't do enough damage to your country in particular, eh?
I has ravaged my country. However the bad situation of germany at that is to be blamed on the French for being too soft on this country after first world war. They should have been kept under control.
Also, the spanish flu has killed between 50M - 100M according to the most recent estimations.