LOL, how blind are you?
In your world America moved right because of Norman Lear’s most effective sitcom, and MASH?
All in the Family was incredibly effective for the left, as was show after show after show, including MASH, they all helped change the national perceptions of normal, of acceptable, of what people thought their neighbors were thinking.
The culture kept moving left, it didn’t stop, despite what you think.
As the elites go, so goes the nation. Sadly, we are long past the time when people are allowed to make up their own minds, or make their own social policy in their communities. The federal government has been grabbing power at least since FDR -- almost a third of our nation's existence. FDR's advisors were largely infiltrated or influenced by active European Socialists or Soviet Communists.
Most Americans lived in rural than urban/suburban areas until 1939; but as the IRS and the growing use of electricity, telephones, radio and eventually television and the superhighway systems gathered power in the 50s, we were done for. It was all over but the shooting. The feminist movement and the push for all kids to go to universities, many far from home and family instead of the local State U., were planned incursions by Socialist International, whose motto was "make haste slowly."
There is a freeper named Progressing America who has a huge amount of documentation on his/her home page, including a transcript of the invaluable chronicle of socialist/communist infiltration written in 1964 and now out of priint, The Fabian Freeway.