Which do you believe is the most pressing problem that threatens the fall of our civilization today?

It would help if you had a list of examples. But to name one or two of of the top of my head, I would say the biggest threat to the human civilization today is going to be either humans themselves or AI (artificial intelligence) which can include cars, phones, computers, alexa, etc... but I would say cas are the most deadly form of AI. (those self driving Teslas not only drive themselves, but are actually listening to your conversations, phone calls, etc... don't ask how I know this but I can tell you this, if you're ever around a Tesla be very careful of what you say and do. There literally watching and listening to your every move!)

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation:

although the crusades failed to capture jerusalem, they had several major impacts on western europe. they increased the authority of the king: sometimes nobles died in battle without leaving an heir in which case the king got their land. kings passed taxes to pay for the crusades.