Two caretakers ushered in the age of Postmodernity
Supposedly it happened in 1945, although even normally fastidious professional historians are unwilling to footnote exactly how they know that "fact" to be true.
(How can you tell when a historian is lying or 'winging it' ? When you can't see their footnotes move.)
I think it all came down to a couple of low level caretaker janitor grunts, busy tidying up the monument (closed all through WWII) so it could be re-opened.
They, and they alone, decided that Emma Lazarus's words now really spoke to them, particularly after the recent horrible revelations at Bergen-Belsen and Buchenwald.
With an unspoken mixture of pride and shame and guilt motivating them, they quickly and quietly unscrewed the little plaque and screwed it back up again just as quickly and quietly at the main entrance.
That is how, with a quiet whimper of a janitor bemoaning a too small screwdriver (and not with the loud bang of an A-Bomb) an Age and an Era really dies.....