Also women working in the factories during WWII, was a game-changer as well.
They ("Rosie the Riveter" and her ilk) were, for the most part, thrown back out on their ear after the war ended (the "war heroes" were returning to their peace-time workplaces and were, naturally, accorded priority). The subsequent "Baby Boom" wouldn't have happened if the women had really resisted. For the most part, they were happy to discard their welding masks and work gloves and return to the kitchen.
Thus, for the sake of conceptual clarity, I am choosing to consider only factors noticeable after, say, 1946.
The mere fact that "Rosie & Co." had temporarily existed did, of course, leave an impression; it marked a sociological / cultural milestone - but the actual phenomenon (mass female employment - with many women occupying traditional male roles) was rolled back so quickly, that it remained only as a memory.
A powerful memory - but only a memory, nonetheless.
Regards,