What happened during WWII? Medical insurance became a standard work benefit. In those days, health insurance paid for baby circ without question. Also, military docs thought that being intact made it much more likely that a soldier would catch VD from a sex worker. They also thought that having foreskin often caused problems when fighting in a desert or jungle. The views of the military carried enormous weight in those days.
In high school locker rooms in my town and at the Y, and in pool locker rooms in summer, I saw all of one intact boy. The boys I grew up with were a potty mouthed lot, but one sexual subject they never touched on was foreskin and circ. I very much doubt that most of them knew that their johnsons had been surgically altered. Those of who went on to attend better colleges began talking about it a bit when we were in college.
I was surprised to discover in the 1980s, by reading Rosemary Romberg, that there were American men who were very unhappy about their RICs. I was even more surprised to read, starting in the 1990s, that RIC can have deleterious consequences for the pleasure and functionality of both genders. American intactivism is, in my opinion, a social consequence of the internet and of the rise of sex positive feminism. It is also surprising that nearly all of the passion and leadership in this cause comes from married mothers like yourself.
My French mother refused to have me circumcised. When her American mother in law said that she was thinking of having it done without my mother's consent, my mother replied saying that if I were circumcised without her consent, her marriage to my father was history. This was in 1949.
When the history of American sexuality is written, the 20th century obsession to make the penis bald will look very very bad.