Aftershocks — Harry Turtledove

World War II has evolved into decades of epic struggles and rebellions targeting the aliens known as the Race. As the 1960s begin, one of Earth's great powers launches a nuclear strike against the Race's colonization fleet--and the merciless invaders find themselves confronting a far more complex and challenging species than any they have encountered before. Ultimately, only superior firepower may keep Earth under the Empire's control--or it may destroy the world. While uprisings and aftershocks of war shake the planet, one nation plots a stunning counterattack... .