It's just that, to paraphrase musical philosopher Dan Hicks, you can't miss it if it won't go away. Nostalgia, like Rice Chex, antacid tablets, and Dan Rather, is a product of modern urban industrial society, which is continually assaulted by change (AKA progress, for the optimists among us) and where most people have lost their sense of connection to the land. In a traditional agricultural society there's nothing to get nostalgic about, since you're still living on the land and yesterday was pretty much the same as today.
// http://www.straightdope.com/columns/read/2630/we-get-nostalgic-for-victorian-christmases-what-did-victorians-get-nostalgic-for
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