Confederation (Gaia Ascendant Trilogy, #3)

The Origin of the Confederacy of the Three Species

After aliens attack the Earth, the surviving humans exist in a post-apocalyptic world and are divided into groups that contest power.

One group has allied with two alien races. The disparate races have united in using technology captured from the original alien invaders.

Seemingly impossible tasks face this fledgling confederation: They must destroy the threat still posed by the original invaders while being involved in a conflict with barb...