Science Fiction Gave Literature New Frontiers

The shift in subject matter from westerns to science fiction was probably already underway when Burroughs began writing. The frontier, which had been such a key feature of American popular fiction, was rapidly disappearing, and writers had begun looking for new frontiers—hence, the increasing number of stories about lost civilizations in unexplored parts of the world. But even the unexplored parts of the world were shrinking rapidly, and as new technologies, such as aircraft and rocketry, b...