Harry Turtledove's "The Road Not Taken" -- Fun, actually un-PC sci-fi where humans are superior good guys; PLUS: My slamming an idiot about it.
Harry Turtledove's 1985 work, "The Road Not Taken," is the story of an alien race with space travel capability, but no other technology much beyond the Revolutionary War period. They land on 21st-century Earth intending to invade, only to--as would be expected--be sounded defeated by our Earth technology. The idea is that they had discovered a simple method of gravity manipulation for travel far in their past, and it had diverted their attention from other scientific advances. Humans, however, had not made this discovery, and so our science advanced us in virtually every other field. The result is ultimately a human race superior to aliens visiting it. In activist science fiction, which like all areas of literary activism is almost always liberal/Left, humans are generally put down as either inferior or aggressive. When going for social allegory, humans are the stand-in for Whites, with the aliens being other races. By that, Turtledove's story would today be consider...