<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>and taking into account that this would depend greatly on what type of person you were, the best option would be the one having to do with New Deal War Programs, since these programs put thousands of people to work who had been previously unemployed.</span></span>
The most important reason for the collapse of Rome was the failure to actually integrate what they conquered. When Roman soldiers conquered new lands, it was rare that they ever attempted to force their culture, ideals, or laws upon the natives and barbarians. Thus, when the Empire began suffering internal struggles, the natives they had conquered decided to take action, which lead to the swift collapse by barbarian invasion from all sides. It's hard to pick a LEAST important reason, seeing that there were many of them, but I suppose a contender would most likely be the common refusal of the Empire to even acknowledge that barbarians were rising. On the outer edges of their territory, in places like Gaul and Morocco, the Roman government was reluctant to even recognize the threat of the barbarians, thinking that even accepting that these barbarians were causing trouble would weaken their prestige in the public eye.
The great depression began after ww1, and there was a continuing cycle of debt for them. ( falling farm prices)
hope this helps :)