Joseph……………….
you have no scientific type data to back up your claim and such a study was ner performed by a group such as the Pew Report.
OOT is a different world. If I look at the communities I’ve lived in, the Stharkers (baal batim) who built and funded the synagogues, day schools, yeshivos going back to my parents’ generation (born 1920 in the US) were men who married after completing their college educations and starting in the work force. Some, like my father, married during WWII and after being disccharged form the armed forces started career and family in 1946.
The vast majority of the pre 1924 Jewish immigrants to the US wanted to live the American dream in harmony with Jewish Observance. That meant college education (my parents like many at CCNY and Hunter) then marriage, jobs, children.
The Kollel phenomenon and early marriage while being supported by parents and in-laws only became common with the arrival of post WWII immigrants and those escaping the Hungarian Revolution.
We both can ONLY present anecdotal evidence on this issue, but I dispute your claim of ‘vast majority.’