No problem... Hope you enjoy.
They start with "How Few Remain"... In the first 10 pages, the Confederacy wins the Civil war. Then the story goes to the 1880's, with the Confederacy buying a couple of provinces from Mexico and building a transcontinental railroad.... Jeb Stuart vs Geronimo Indian skirmishes. I think Longstreet may be Confederate president in that book (been a few years since I read it). And, oh yeah... the Mormons in Utah revolt which becomes a sub-plot of suppression and revolution through the whole series.
Then there are 3-4 set in WWI. Another 3-4 set in the 20's and 30's. And finally 3-4 set during a WWII.
No, far from Confederate/Nazi fantasy. Turtledove was a Byzantine history professor before he turned to writing. He does his homework on alternate history. I don't always agree with the conclusions that he draws, but his are all very plausible. Some of the people in his books are pure fiction, others are thinly veiled farces (the ineffectual vice president of the CSA in WWII is Dan Partridge, for example), and others are famous people in new roles. Researching who is who is part of the fun of reading Turtledove's series.
The US is not always sympathetic in the series... Losing a couple of civil wars militarized it more than in our history. And with England and France siding with the CSA, the natural enemy-of-my-enemy is the Kaiser's Germany, which provided a model for the US. Plus, they are kind of heavy handed with the occupied territories of Utah and Canada...
He has another series of only two-three books where the Japanese follow up the bombing of Pearl Harbor with a full invasion of Hawaii.