Name for me a single twentieth century cultural shift, in the "western world," that wasn't about the individual's triumph over the collective.
I would say that the environmental movement was/is about a recognition of collective responsibilities.
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.