I think, I broke Perplexity by asking when, in human history, a society switched from a fiat standard to a hard or sound money standard. Even though I said that nothing after 1971 counts, because then the whole world transitioned to the fiat standard, and Perplexity accepts that, it could not provide me with a single historical occurrence before 1971 where such a thing happened.
Except this one:
"Diocletian's Reforms in the Roman Empire: In 301 AD, Emperor Diocletian introduced reforms aimed at stabilizing the Roman economy by introducing the solidus, a gold coin that was 99% pure."
After that, it kept repeating some South American societies binding their money to the USD after 1971.
So: Will Bitcoin really replace or abolish the money printers in near future? That would indeed be a historical event.