A Brief History of the Fantasy Genre

While fairy tales are ancient, dating back to the Bronze age, fantasy turns out to be a revival movement, rising from the grave of the recent dead. Mention of the word fantasy is minimal through through the twentieth century, with some peaks here and there depending on your source. Around 1945, fantasy took flight, soaring up and up, well into the twenty-first century. Why the change? What summoned the word fantasy back to life in 1945?