Egyptian and Roman Empires? Where is your data suggesting that their collapses had anything to do with fiat money?
USSR? It's pretty clear that they suffered a lot due to economic mismanagement (i.e. inefficiencies due to how their economy was run), but that had nothing to do with whether fiat money was involved or not.
Zimbabwe? The causes of hyperinflation was a combination of a collapse of (especially) the agricultural sector and foreign-currency denominated debts. Both events were caused by political decisions, not by fiat money.
It is likely that all the collapses you mentioned (including the ancient ones) involve some level of economic mismanagement, where the productive capacity of a society was destroyed, misallocated, or left idle.
Fiat money was never the problem. If you disagree, please point out how fiat money was the problem, instead of only asserting it.
USSR? It's pretty clear that they suffered a lot due to economic mismanagement (i.e. inefficiencies due to how their economy was run), but that had nothing to do with whether fiat money was involved or not.
Zimbabwe? The causes of hyperinflation was a combination of a collapse of (especially) the agricultural sector and foreign-currency denominated debts. Both events were caused by political decisions, not by fiat money.
It is likely that all the collapses you mentioned (including the ancient ones) involve some level of economic mismanagement, where the productive capacity of a society was destroyed, misallocated, or left idle.
Fiat money was never the problem. If you disagree, please point out how fiat money was the problem, instead of only asserting it.