[virgil]

They see diversity as a weakness. Diversity is a weakness if a government local, state and federal cannot defend its people because it is paralyzed by an oversized immigrant population that they don't want to offend. That is a weakness of republics. See Roman Empire.

[Chuckster]

That is a weakness of republics. See Roman Empire

That's sort of an oxymoron isn't it? I mean, it was the Empire that fell in corruption and decadence, not the Republic.

Your point is valid for the reasons given. But,IMO,the Roman republic would never have fallen under this kind of circumstance simply because the populace, during the Republican period, was unified and homogenous and had not fallen into the effete decadence of the later Empire.