Worldwar : upsetting the balance

Worldwar: Upsetting the Balance is an alternate history novel by American writer Harry Turtledove. It is the third novel of the Worldwar tetralogy and the third installment in the extended Worldwar series, which includes the Colonization trilogy and the novel Homeward Bound. In this book, now armed with nuclear weapons, the United States and Nazi Germany strike back at the invading aliens known as The Race.