Following a cataclysmic conflict known as the Sixty Minute War, the remnants of humanity regroup and form mobile "predator" cities. Under a philosophy known as "Municipal Darwinism", larger cities hunt and absorb smaller settlements in the "Great Hunting Ground", which includes Great Britain and Continental Europe. In opposition, settlements of the "Anti-Traction League" have developed an alternative civilization consisting of "static settlements" (traditional, non-mobile cities) in Asia led by Shan Guo (formerly China), protected by the "Shield Wall". Relics of 21st-century technology such as toasters, computers, and smartphones are valued as "Old-Tech."