Between 1971 and 1979, All in the Family was more than just a wildly popular television sitcom that routinely drew 50 million viewers weekly. It was also a touchstone of American life, so much so that the living room chairs of the two main characters have spent the last 40 years on display at the Smithsonian. How did a show this controversial and boundary-breaking manage to become so widely beloved? Those Were the Days is the...