Bashing Trump is a no-no but bashing Clinton is OK?
As for the fall of the Roman empire, I assume you mean the Western empire, and there are a myriad of theories and causes for its collapse, from natural disasters, to the over-reliance on slave labor, to the lack of interest in the military, to the prevalence of barbarian tribes and the reliance on mercenaries from those same tribes to protect the borders, to coups from their generals, to the rise of Christianity and the subsequent fall of tolerance for other religions.
Federal protections are what protect minorities, particularly at the state level. If we didn't need the federal government's intervention then their actions to protect minorities would be redundant. Modern events show otherwise, with ever-increasing legislation against us as a class on the state level.