OK, here is a FANTASTIC READ! This is by far one of the most fascinating novel series I have read.

WORLD WAR & COLONIZATION SERIES (link is for Book One)

This is an alternate history of HARD SCIENCE, i.e. the Science Fiction is ALL plausible, no Laser Guns (though they have lasers in DVD players), or anything of that sort, where an alien race's fleet of Conquest ships have arrived on earth.

To give the basic plot here, Fleetlord Atvar of the Race (a race of Lizard like creatures), arrives with his conquest fleet approximately 30 years ahead of the Race's Colonization fleet at Earth. Their Probes sent earlier revealed a world in which Humans we in the midst of the Dark Ages, but when their fleet arrives, we are at the height of World War II, a fact the upsets them quite a lot and is one the major underlying themes of the series, the fact that Humans advance technologically faster then them because of our reckless nature.

The novel series spans all of World War complete with characters like Roosevelt, Churchill, Mordecai (jewish freedom fighter) and many other characters from our real history to many imaginary characters as well.

Again, a great read.