Why so many conservatives have nostalgia for an era that wasn't all that golden. Next January, just in time for a potential presidential bid, Marco Rubio will publish a book. It’s called American Dreams: Restoring Economic Opportunity for Everyone.Call me a killjoy, but I don’t think Senator Rubio can make good on his subtitle. Creating “economic opportunity for everyone” is hard enough in a country of 316 million. Restoring it is a metaphysical impossibility. To restore something, it must have existed before. And never in its history has America offered “economic opportunity for everyone,” not even in the Edenic days...