Visits to historic sites such as Pompeii make this clear. The monumental work of Gibbon details it.
The genius of William Faulkner explored the decay of civilizations, notably in Absalom! Absolom! He saw the entire history of the world in a small Mississippi town.
The USA has been in grave danger of falling into the same fatal trap; however, the American People rallied behind Donald Trump and reversed the decay. If he succeeds--and it appears that he will--America's recovery from the fatal disease of decadence will be unprecedented in history,
But the miracle of the USA--God's grace shed on America and all the world--is unprecedented in history.
The USA is a miracle.
If the American People save the USA from decadence and destruction, the miracle will have been even more spectacular and sacred and an even greater gift to the world.
Western Civilization has miraculously defeated many diseases. If it defeats the disease of decadence, this will be one of the greatest of miracles.
https://www.worldhistory.org/article/2153/gibbons-decline—fall-of-the-roman-empire/
> The dominant theme of Gibbon’s six-volume work is that the fall of the Roman Empire was due to the rise of Christianity with its negative effects on the people and politics of Rome.
“Visits to historic sites such as Pompeii make this clear. “
The Roman Empire lasted 400 years after Pompeii was destroyed.