My point is that every nation follows the same life cycle: the golden age, stagnation, social strife and internal squabbles, normalization of amoral behavior, t

My point is that every nation follows the same life cycle: the golden age, stagnation, social strife and internal squabbles, normalization of amoral behavior, the steep decline of birthrate and replacement by invaders, be it barbarians or another civilized nation. We're somewhere at last stage, but the US is big and it may stay another hundred years in this quasistable state.