It ended on an uneasy truce, the world was at a semi level of peace, the Race had settled in the lower hemisphere of Earth with the USSR, Greater German Reich, UK, USA remaining free from the clutches of the aliens... Turtledove had ended it there on a note of definate "status quo".
Now, it's 20 years later and the colonisation fleet has finally arrived on Earth, Turtledove continues in creating belivable characters and succeeds in updating such familiar characters such as Yeager, Strata, Atvar & Ludmilla while exposing the fates of the rest of the cast from the first World War series.
It's easy to slip back into reading this book as if you're reading one of the first trilogy, nothing has changed, and once more the Race, the Humans and of course the reader are embroiled in a massive plot which will span another three books..
Here's to Colonisation: Book 2... Please come soon.