Thomas leaves and the whole of Kentucky unravels, that was a brutal battle.
There's going to be a "do I stay or do I go" bit of thinking in Washington/Philadelphia! They've got to do something to get their house back in order on all fronts.
What does the domestic British political situation look like? I remember a lot of the British working class were quite sympathetic to abolitionism and the Union and probably aren't too thrilled with getting into a war to support slavery.
There's two more chapters I'm writing on the military side, a bit of a postscript to the major campaigns and some naval oddities to pad out the military side of 1863, but after those I'm already working on the political updates for the Union, the Confederacy, Canada and Britain.
For some hints:
Chapter 75: A Fire in the Rear
Chapter 76: Crossing the Gulf
And that will round out the year 1863 for Chapter 77: 1863 A Year in Review
I wonder what happens with Japan, France, and Russia, aka Britain's major allies in OTL WW1. I've seen TLs where the alliance system is the same as OTL except the CSA and USA take opposite sides (or both join the Entente) and others where literally none of them are allied with Britain and America is best friends with Russia.
I think I've said before that I don't intend to do TL-191, Mr. Turtledove did that bit of history well enough that I have no intent of following the template! I have some ideas, but there's going to be some interesting butterflies which have effect in the 1860s. From China, Prussia, to Russia and Japan, we're going to see some very different events in the 19th century!
On the one hand, they really won't like the CS, and those feelings will likely make themselves felt after the war ends. The Confederacy will likely find that their independence is a poisoned chalice, as relations with Britain will be frosty at best so long as slavery is a thing.
On the other hand, the US was stupid enough to start a war with the British Empire. The overwhelming majority, including the same people who despise the Confederacy, are going to be very pissed off at the US for that.
Independence for the CSA would be, interesting. The British did not join the war to help the Confederacy gain independence, but there's a cadre of politicians who are keen to see it happen. The Confederacy and Britain would not find their interests aligning very strongly, but depending on how both nations interact with the US things would
maybe put Britain on the "hold your nose and do it" path to cordial relations with the South. That said, there's anxious noises coming from the Tuileries on what's happening in North America, and Britain doesn't exactly like
that either.
Though one thing I'll say is that abolitionists in Britain are hopping mad about the war. Not that Britain got involved, but from their perspective that the Union
got Britain involved in the first place. The Duke of Argyll in particular is not exceedingly happy about the circumstances he finds himself in, though he's a bit out of the loop on the decision making process, but I'll cover that more in Chapter 76.