Is your book already in print or is there time to correct your mistakes?
Janary 1, 1863. -- Lincoln frees the slaves.
Lincoln did not free the slaves in 1863.
April 9, 1865. -- U.S. General Grant accepts the surrender of the Confederate army from an unknown general.
U.S. General Grant accepts the surrender of the Confederate army Army of Northern Virginia from an unknown general.
There were other Confederate armies with different generals surrendering at different times at different locations.
That’s my book right there, and you’ve made the correction. I know about the Emancipation. I know about the Army of Northern Virginia and the other armies, but I didn’t want to bother the reader with that kind of detail. This is a book for the modern reader who wants a high-altitude view of the war, and doesn’t have time for minutia such as the causes and effects of the war, the battles and flow of the war, the complexity of the personalities who fought the war, and painfully irrelevant and boring historical facts.