Everyone agrees that Post-Modernity began after 1945 and that thus, in some muted --- pastel --- fashion, Modernity must also have began its slow decline in that same momentous year.
Most writers just dial in some reference to Auschwitz and Hiroshima and leave the rest unsaid and assumed
- a few might add a bit more references to the bombing of Hamburg and Dresden and the revelations of the Nuremberg Trials, particularly the so-called Doctors' Trials.
So 1945, Year of Revolution.
Could any other "Year of Revolution" have happened in such an un-dramatic fashion?
No leaders' fiery speeches, no burning Manifestos, no mass protests or barricaded streets.
For 1945 was a Revolution from within, a collapse, a revolution of failure,defeat, negation.
Modernity defeated itself, Modernity simply self-destructed.
In 1939 it set itself the highest possible goals - this would be history's first fully modern war, its first fully scientific war (or at least first fully scientism war).
Of course, nothing in WWII worked out as its various protagonists planned.
Its seers and futurists were equally naft in their predictions.
At the cost of 60 million dead , billions emotionally scarred and trillions in waste and destruction, Modernity laid an egg.
Or a mushroom - your taste......