You are living in the fantasy land of inserting optimistic long term solutions into your scenario.
In the short term, everyone but the government has less money to spend and workers are out on the street because the companies they worked for had their supply chain interrupted.
However, I believe in giving credit where it is due, so if you want to argue that tariffs were not the only cause of the Great Depression, I will agree. Unfortunately, if you are saying that the fact it was a significant contributor is a "lie has been disproven long ago," you are back in fantasy land.
Exports accounted for _______ of GDP in 1935?
If a tiny fraction of the economy disappeared ENTIRELY could it cause a depression or exacerbate a depression?