There is a kind of woman who is economically powerful, professionally powerful, who threatens a white male grip on power that has a long historic precedent in the country. Independent women living outside of marriage threaten all kinds of things about the way power is supposed to work.
'Marriage' was not that big a deal, to be honest! I mean, it makes life easier for technical reasons: insurance, next-of-kin stuff, joint tax filing, etc. The real shocker was falling in love with the man I'm married to. I was 32 when we met, and I had really never been in a functional relationship before, had never been deeply in love.
During childbearing years, changing jobs - even for a fundamentally better gig - can be a very bad idea. Those prime childbearing years - mid-twenties to early forties - overlap precisely with prime professional years. This is when employees are most attractive to new employers, when they should be able to zip up ladders with the most alacrity.
Plenty of the women who were single in the nineteenth century wrote about their desire to evade marriage. Marriage was scary in a lot of ways. It often involved having a lot of kids, losing your autonomy, being in service to a husband and children who were often born at an unremitting pace without the benefit of modern medicine.
One of the things that gets confused often is the difference between marriage and good marriage. Marriage is a theoretical concept of the institution, and 'you should be married,' is actually meaningless. Marriage is pretty meaningless without the notion of having a specific person to whom you are married.