fyi, /u/oldworldglory rounded up a bunch of informative posts on this recently, check this out

• I was looking for a FAQ in this sub about the causes of the Great Depression in the US and was surprised to not find any (unless I missed it). So, what were the causes of the Depression?

As for the second part of your question, just a note that none of the historians will touch that here: speculation/conjecture are not permitted in this sub, nor are discussions of current affairs. You might consider taking that to a economics subreddit