The "America is dead" crowd has already decided, so there's not much that would get through, save for a bolt of lightning, out of the blue.
Plus there are all the usual suspects saying that "America is nowhere in Bible prophecy". Again, bolt of lightning maybe.
Luke 16:31 And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.
It's like that.
Luke 8:17. For nothing that is hidden shall become manifest.