I suspect that the rise in the divorce rate has a lot to do with the deterioration of the essentially Christian worldview which used to be the foundation for our culture.

Competition for dominance is built into our DNA. Civilization itself is more about cooperation than competition it requires the suppression of our nature. Civilization transforms the meaning of freedom from I will do as I please to I will have the resources to not be a slave to nature if I cooperate with other members of my civilization. In a very real sense feminism reflects a surrendering to nature. It adopts natural fairness which decouples it from basic productivity. Like all collectivists ideologies it increases poverty by disrupting voluntary cooperation.

I agree, marriage is not a competition for dominance but a cooperative personal relationship.

Feminism is a collective competitive movement that makes no differentiation between co-operative personal relationships and socially competitive fields. Everyone, to a feminist, is competition. They stand alone.
It's a dangerous and fallacious ideology where close personal relationships are almost impossible for them to maintain. That they don't make this differentiation in their personal relations and socially competitive fields leaves them oppositional, assertive and bullying.

This is feminism today. Their rallying cry for collective activism used to be "equality", not an unfair objective in itself, but it has developed into the desire to be more equal. Abandoning all cooperation and goals of equality for superiority.

I respectfully submit that competition is a side issue.

Marriage only works with two mature individuals. Most people are emotionally immature, and almost completely incapable of orienting themselves to the best interests of another person. In short, most people are self centered. Americans are no exception.

However, even a mature person has some kind of emotional blindness. A mature person will be aware of their own weakness, and will choose a person without the trait that complicates that weakness. Even if attracted to a mature person who is not constructive for them - just an unlucky combination, a mature person will not choose them.

Mature people who do not stimulate each other's weaknesses will still disagree, and may occasionally argue, however they will almost never fail to respect each other, nor fail to forgive, nor lose sight of what is important and essential to the well-being of their partner. They will always be willing to do whatever is necessary in their partner's best interests - even at their own expense. For the man, even the willingness to give his life to protect the woman.

In America, the land of pre-nups, that concept is almost unthinkable.

For the family unit to be restored in America, everyone must seek maturity, or find it in adversity. There is much to be learned from Scripture on that subject. IMO, there can be no love except that which is modeled after God's perfect, unconditional love for us. So a wise family unit will choose to serve God as its priority, and thus will become strong and resilient.

Ephesians 5:22-33.
Wives, submit to your own husbands, as to the Lord. 23 For the husband is the head of the wife even as Christ is the head of the church, his body, and is himself its Savior. 24 Now as the church submits to Christ, so also wives should submit in everything to their husbands.
Husbands, love you wives, as Christ loved the church and gave himself up for her, 26 that he might sanctify her, having cleansed her by the washing of water with the word, 27 so that he might present the church to himself in splendor, without spot or wrinkle or any such thing, that she might be holy and without blemish. 28 In the same way husbands should love their wives as their own bodies. He who loves his wife loves himself. 29 For no one ever hated his own flesh, but nourishes and cherishes it, just as Christ does the church, 30 because we are members of his body. 31 “Therefore a man shall leave his father and mother and hold fast to his wife, and the two shall become one flesh.” 32 This mystery is profound, and I am saying that it refers to Christ and the church. 33 However, let each one of you love his wife as himself, and let the wife see that she respects her husband.