The bicentennial.
OK, so most of you weren’t around then.
But, we- America- put on a hell of a party back in 1976. Took over the entire National Mall in DC to celebrate. And, we probably were pretty united since we had just escaped the vitriol, chicanery, and criminality of Tricky Dick (Richard Milhous Nixon). Having our first non-elected President. Oh, sure, you will tell me that we’ve had lots of Vice-Presidents take over when the President has died- or been murdered.