...I couldn't say about the 1860's-1890's, but I can definitely say that in the 40's-60's that Hollywood was already a festering pit of leftism and communism.
Hollywood yes, but you still had a huge conservative presence in Hollywood at the time and centrists like Disney throwing thrit weight behind them.
And if you want to point out any kind of pop culture insitution that conservatism had a hold of from 1975-now, aside from Talk Radio, I'm all ears, because it'll be news to me.
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Well for starters most heavy metal was right wing even the weird Satanist guys were. A lot of the comics coming out at the time were penned by moral objectivists or if they were left wing they were hardcore nativists and protectionist.
Hell even leftist pop cultural movements at the time were torn between Marxist globalist and militant working class protectionist guys.
You had fuckers like Clapton and even Bob Marley IIRC endorsing people like Enoch Powell.
There's the popculture myth and then there's the reality. The left has never held the kind of control they hold now.
It's all a psyop to demoralize and make you think you're metaphorically outgunned they have always been one angry bastard shit talking at them and ginning up the grillbros away from total defeat.
The problem with the right was the Cons spent a lot.of their power being moral busy bodies (which actually inspired Wokeism, who are aping a lot of the tactics used by the old religious right) this obsession with faux kindness and compassion and enabling is an artifact of the mistake that blew it for them and showed the enemy how to win.