The White Fox Chronicles — Gary Paulsen

The year is 2057. Endless wars have torn the USA apart and enslaved Americans to the CCR, the Confederation of Consolidated Republics. Growing up in the wasteland of war has made 14-year-old Cody Pierce wise in survival skills, and now he's the White Fox, rebel leader of the children's barracks in a CCR prison camp. Once he escapes, life with the underground teaches him new skills in weaponry and strategy as he plays cat-and-mouse with the CCR. Every day brings him closer to capture, as well as to his goal: to return and liberate the children he left behind.