I remember my mother telling me about needing my father to cosign in order to get a loan in the late 60's in order to buy the Christmas gift she wanted to buy him that year.
I remember one of my grandmothers telling me that back in the day, either her own or her parent's, female teachers had to be single but male teachers had to be married to teach 1st-12th. She was born in the 1910's.
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Before the Women's Rights movement, the US, at least, was a very different place. A woman in a field other than nursing, teaching or secretary? Ha! There might have been one or two with men's only occupations here or there, but not many.
As for the official occupations? They better be single and stay single or else. Probably nothing worse than getting fired, but still.
Oh, and if historical shows are any indication often the occupation itself was a way to get out and meet a potential spouse so she could quit, get married and have children. Since, you know, she didn't need to have a job and support herself since she was married.
If the original poster wants the book to be historically accurate, it does need to be an either or choice. If there is potential for romance, I do think the writer needs to virtually hit the readers over the head with the fact that it was a different time and that the MC is serious about her choice. While doing so in a way that is so seamless it is effectively invisible to the reader.
Or have her marry a doctor who is willing to let her work in a private practice he owns. Not that she'd work much, if any, once she starts having children.