IamRaider
Gamera
The Turtledove book is interesting, it really gets moving over a third in where Lee and company start putting together the pieces that their mysterious benefactors don't have the best interest of the CSA at heart. Or the USA or pretty much anyone in that time period.
I love the what if aspect. He has another series that follows into the World Wars and how different everything might have been had the south suceeded.
At the risk of veering off subject here I have those novels but haven't gotten to reading them yet. I did read his series where these aliens invade Earth right in the middle of the Second World War. We end up with Germans and Soviets in Europe and Americans and Japanese in the Pacific having to work together to fight the aliens.
And then the sequel trilogy set in the '60s. Due to there never being a real ending to the war the Imperials still rule Japan and the Third Reich still rules most of Europe. And now the US, UK, USSR, Japan, and Germany are all armed with atomic weapons. Even worse the aliens were on a one-way trip with no way to get home so the peace treaty gave them large areas of Australia, South America, and Africa for homes where they rule over the native humans. Now some of the captive aliens warn of a second fleet full of alien colonists on it's way.