Why does it have to be 70 years? Can we do 10 20 30? Then I don’t believe the overtone window is that obvious 30-40 years ago you were considered bad if you bought a right wing newspaper, people would stop talking to you. (Well at least where I am from)
Yeah, sure, let's do 10, 20, 30.
30 years ago Black folk were being called 'superpredators' and blamed for a 'crime wave', the push to dismantle the meager welfare state in the USA was wildly popular, immigration law was reformed to militarize the border and deportation, being gay was illegal in about half of US states... do I need to go on?