I am researching the impacts of the Roaring Twenties. I feel one of its biggest impacts was impressing into Americans that they were each part of a social group or subculture, however niche.
For example, the realisation of more rebellious female youth that they identified with Flapper culture. In the present, the realisation can be compared to that of bookish, introverted people that they identify with the 'bookworm' stereotype.
Is there a word or phrase for the realisation that one belongs to a certain social group and identifies strongly with said social group?