It is actually well researched and in spite of the premise, one that will be severely attacked later in this thread, makes for an interesting read.
All I’m getting is a red ‘x’ but if you’re recommending Harold Turtledove I really enjoyed is novels of a victorious South and how history would have changed in the insuing decades.
I read one of his altered histories where some white supremists manage to travel back in time from the 20th century and arm Lee’s army with AK47s. Boy, was THAT one a fun read.
Also, Gingrich wrote a series of these type of stories imagining how things would have changed had Longstreet won his argument with Lee at Gettysburg. That one was fun also.
But for the best dramatised history I would highly recommend the Shara (spelling?) series, Killer Angels, Gods and Generals, and whatever the last one was, I can’t remember the title off the top of my head.