Subject: Re: If Biden Hadn't Known...
And oops, I left out the apparent historically agreed upon actual end date:

On May 26, 1865, Confederate Lt. Gen. Simon B. Buckner, acting for Edmund Smith, signed a military convention surrendering Confederate forces in the Trans-Mississippi Department.[210][211] This date is often cited by contemporaries and historians as the effective end date of the war.

From https://en.wikipedia.org/wiki/...