Exactly. I am not trying to blame either sex, but I do think feminism has negatively impacted on our modern culture.
I think that alot of women are mad at the fact that alot of men still have that old idea that woman are beneath them. That women are around to cook, clean, errands, etc. Remember...the old school books used to tell women to actually get up earlier than your husband....to fix yourself up so you look pretty before he sees you and to get breakfast started. That makes me ill.
Feminism has something to do with the change, I think. But economics is also a major factor, and it has been so for centuries. In the middle ages common folk did not get married until their late twenties, in spite of the drastically shorter life spans that we have now. They did not marry until they (both men and women) had worked long enough to save money to set up a household and support themselves. Even then they did not marry primarily for love, the first issue in any marriage was whether the two people had enough resources and income between them to raise a family. If they didn't, they didn't get married and they didn't have children.
The major reason for early marriages in the United States was because pioneering a new nation could not be done singly, one needed a partner. And also a marriage meant you could grow your own helpers in the form of children.
There are many issues that go into changes like this, and changes like this have been happening for centuries.