Responses to global depression should entail a concerted effort by governments around the globe to instill confidence in the global financial system and maintain stability of the monetary system. Confidence is important as it will help stimulate consumption which is critical in economic growth. Stability is vital in ensuring that investors do not resort to cash flight.
I believe the answer is A, The Renaissance
Pope Urban called a crusade to reclaim the holy land
I don’t know if the Vietnam War counts but that’s my best guess.