What day would you select? The surrender of The Army of Northern Virginia (R. E. Lee), the surrender of Joseph Johnston’s army, the surrender of the armies in Texas, or some other date?
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None of the above.
The [insert pet name of the American conflict 1861-1865 here] was really over in 1863, in early July, when Lee’s northern experiment crashed and burned along with the fall of Vicksburg.
At no point following that did the Confederacy have any chance in succeeding.
So let’s use July 4. The best part, we already celebrate it.
I call it the War of 1861. That keeps all the politics out of the discussion.