Old Folks See Culture Change
overcomingbias.com
overcomingbias.com
You can trace individualism to various started places, like the Protestant Reformation's assertion that individuals have a direct connection to the divine. But certainly by the time John Stuart Mill took up the cause, it already had a great deal of momentum and it was adopted as an ethos.
Since Mill, almost every cultural shift has been reconciling the baggage of the past with individualism. The civil rights movement, women's suffrage, the decline of organized religion and promotion of "individual spirituality" all have the through-line of individualism. Name for me a single twentieth century cultural shift, in the "western world," that wasn't about the individual's triumph over the collective.
There are some more recent exceptions from this century though, where the pendulum might be swinging away from the individual and toward the collective. Emphasizing group identity over individual identity comes to mind as an example.
I would say that the environmental movement was/is about a recognition of collective responsibilities.
You can certainly see other collective action problems that have gotten a government response. The movement to build nuclear weapons was a collective action, but it wasn't really a change in culture.
AFL-CIO https://en.wikipedia.org/wiki/Labor_unions_in_the_United_Sta...
Civil Rights Movement
Solidarność (if you're willing to count Poland as west, that is)
Copyleft
You probably have a point about labor unions. Though, it's worth pointing out, that their triumph was more weak the more west you were. The labor movement in China and Russia produced communism; the labor movement in the United States produced, well, the ability to form in general.
Anti-communist movements in Poland I would also be inclined to chalk up to individualism. They were individuals fighting authority.
Really? I think the Gnostics have long been on that path if one is crediting the Protestant Reformation...
Why?