I said earlier that America started to decline 9/11/2001, but I am rethinking that --- it was earlier, when we went into Vietnam pointlessly and lost that war. We've lost pretty much every war since, except Clinton's one against Serbia and Reagan's against Grenada. (Grenada??!? Their soldiers surrendered at once; their nutmeg trees fought on for longer.) The decline has been continual since Vietnam. No country can survive losing a lot of wars, again and again.
Uncontrolled immigrations is how Rome fell, of course, and both the USA and Europe are falling for that reason, barbarians crowding in and taking over, high crime, looting of cities. Homogeneity of populations is what makes a strong nation, but we no longer have that and are declining precipitately. Too bad, but there it is. War is coming.