1，货币贬值，经济下降（和现在美国一样）
2，开放移民，特别是在经济不好时期开放（也和现在美国一样）。
3，传染病大量人口死亡。
https://mises.org/library/rubio’s-failure-how-our-broken-economy-fuels-voter-rage
A Declining Empire
The reasons for the decline and fall of the Roman Empire have been endlessly debated. In my own view, there were three, highly interrelated causes. The first was noted by Ludwig von Mises: the Emperors debased the currency and by doing so destroyed what had been a thriving economy, what might be called the world’s first “global” trading economy. So far, we are doing the same.
Second, the emperors increasingly opened the borders to immigrants. This might have turned out better if the economy had been thriving. But with the economy in sharp decline, it made a bad situation worse and eventually led to outright invasions.
Third, pandemics arrived, massive pandemics that wiped out large proportions of the population. We have not yet experienced anything like that, but medical authorities continually warn us that it could happen anytime, and could take the form of a viral pandemic, for which there would be no cure, or a bacterial pandemic such as TB, because we have allowed antibiotic resistant forms to flourish through antibiotic misuse.
It is a long way from Marco Rubio back to Marcus Aurelius, the “good” emperor who nevertheless persecuted the Christians, or the many incompetent or mad Caesars, but humanity does tend to make the same errors over and over again and rarely takes the time or trouble to learn from the past.
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