I don’t know about calling her “America’s mom”, as I’m sure many obituaries will claim, but she was inarguably the “sitcom mom”.
It’s funny. My peers and I (born around 1970) were, obviously, not alive in the ‘50s, but that earlier era loomed large for us. Let me explain: the people who raised us did live in that time, and they were invariably informed by the mores and cultural imperatives of that era. As such, many of our parents were either inculcating or reacting against the buttoned-down (repressed?), black-and-white (i.e., ‘white’) reality as shows like Leave It to Beaver portrayed. Hence, the hippie sensibility that at least had a fighting chance for a few years before the door slammed shut in the back-to-the-future adventure of the Reagan years.