Masters of Evolution
Damon Knight
 In the near future, the world is divided into two antagonistic groups: city dwellers and country dwellers, called "muckfeet". The muckfeet control most of the land area and have a much higher population. The mayor of New York convinces a popular actor, Alvah Gustad, to negotiate an agreement with the muckfeet: technology in exchange for their scarce metals. Alvah reluctantly agrees, and is given a chance to present his wares at a fair in the Midwest. No one is interested; an altercation ensues and Alvah realizes that he is stranded. He is taken in by a pretty young woman named B. J.; gradually he comes to accept and understand the muckfeet way of life, which includes novel uses of genetic engineering in place of machines. Alvah falls in love with B. J. and when the cities launch an attack on the muckfeet, Alvah is forced to reexamine his beliefs about the superiority of the city way of life. ]