That's correct, so I basically altered my understanding of things. In the old days, there really was only one view of marriage, and it was set by law. It reflected the tradtional vows, but was not governed by them. The contract entered into at marriage was to be husband and wife, as defined by the law.
That is the wrong way round - the vows reflected the traditional civil/state marriage.
Not by coincidence, the law defined it the same way the traditional vows did. So, it didn't matter what the couple actually said during the ceremony. They were bound by the traditional vows, or more accurately, by the law of marriage which happened to embody them.
Again you are stating it the wrong way around - the civil contract came first and the religious vows seem to have copied the civil contract.
Today, I think that the government should allow flexibility in marriage contracting, and allow couples to choose what they are legally committing to.
I thought "prenuptial agreements" are legally binding and enforced in the USA?
(In the UK they are not.)