Mars Awakening

I have an exciting new novel I am in the process of finishing. It takes place two hundred years in the future on a colonized Mars. The planet has been terraformed and Humanity has split into two different species. The process and cost to produce a breathable atmosphere put a strain on Earth's resources. So the the effort was scaled back. The air is thinner and only the Maur-tans the stronger offshoot can survive outside without the use of Breather Masks. They live in villages around the planet and keep to themselves. But the pure blood humans live in closed cities and enjoy the riches of the planet and do not share them with their distant cousins. This has put a strain on relations between them. One small spark could ignite a war.