Colonization is a trilogy of alternate history books by American writer Harry Turtledove. It is a series continuation of the situation set up in the Worldwar tetralogy, projecting the situation between humanity and The Race (the bipedal lizard-like invaders and settlers from Worldwar) nearly twenty years afterward, in the mid-1960s. The Race has settled and plans to colonize nearly half the surface of the Earth, including Africa, Australia, China, southern Asia, Mexico, Central America, South America, Spain, Portugal, and Poland (prewar Poland and East Prussia). The United States, Canada, the Soviet Union, the Greater German Reich (Germany and the territories that it occupied during World War II), the United Kingdom, and Japan are the only other powers when the Race's colonization fleet of 80–100 million settlers arrives. Humanity and The Race still jockey for advantages over each other. Source: Wikipedia (en)