The Disunited States of America (Crosstime Traffic Series #4)

In Harry Turtledove's The Disunited States of America, Justin's having the worst trip ever. He and his mother are Time Traders, traveling undercover to different alternate realities of Earth so they can take valuable resources back to their own timeline. In some of these worlds, Germany won World War I or the world has been destroyed by nuclear warfare. Justin and his mother are in an America that never became the United States: each state is like a country, and many of them are at war with...