I never thought this analogy would apply to us as a nation but America is the Roman Empire and the Visigoths, Huns, and the other barbarian groups are at our doorstep ready to invade and take us over.
There are a lot of parallels, but there are also a lot of critical differences, at least for the time being.
To name just one; Americans, meaning primarily patriotic Americans, have enough firepower in their homes to constitute an army. 'A gun behind every blade of grass'.