The birth of the United States was not on July 4th, 1776. It was at 5:29 a.m. on July 16, 1945.
At 5:28 a.m. we thought we could do anything. At 5:29, we knew we could. And for good AND for ill, every single thing we've done has been based on that horrible & certain knowledge. And our attitude (and our arrogance) follows, with some justification.
This is the only version of American history that both fits all of the facts, and explains the utter madness of the Current Weird Times™.