Well, stating that the high divorce rate is "caused" by women working outside the home in this case is what psychologists and scientists would assign confirmation bias.
There is no evidence that you have presented to suggest that one caused the other, they just happened to occur at the same time. But to raise an example that might make you turn your head......
In France, if you do a study (and this has been done) you will find that how well the economy is doing has a strict 1:1 correlation with how short the skirts the trendy women wear at the time. When the economy did well the skirts were characteristically shorter than when the economy was doing bad.
So using the same logic you have just displayed I could assert the ridiculous notion that the economy in France is dependent upon the height of the skirts of the women in France....if that were true then a good economic strategy would be to only produce shorter skirts so that the economy continuously does well and never goes into recession.
Now naturally there is no logical nor casual reason why I should think that one of these things CAUSES the other....But they seem to happen together. Does that mean they are related? Perhaps....but does relationship entail causality? Hardly. It could be a stroke of luck, or quite the opposite.
Perhaps the actual cause of divorce is that men are becoming more indignant and therefore more abusive. Since the men are abusive the women are divorcing them....but there is another option, why not spend time away from home working so that when you get home he is either exhausted or learns to be self sufficient.
If this turns out to be the case then Divorce is neither caused by women working outside the home, nor is women working outside the home caused by divorce but they are related. They are simply both reactions to a similar cause.
On a personal note.....the cause of the rise of divorce in my opinion has to do with the decline in the upbringing of young people. Their upbringing has failed to teach them the correct notion of what love is and therefore they confuse it with another feeling that is not as long lasting and got married at an immature age before they decided to understand the subject better.
Do not fret however....the divorce rate has steadily declined in the past few years, and many speculate that the reason for this is that in the last ten years, since women are becoming more independent they no longer feel pressured to jump into relationships fresh out of high school, they can relax and finish college begin a career and then search for a Mate. The average age of people getting married has increased substantially in the last ten-twenty years most probably both because of social influences and the awareness of the divorce problem. Women are now no longer expected to get married at age 20 and men are no longer hurrying to marry at age 23 like they were in the 70's and 80's....now the average marrying age for women is 24-25 and for men is 27-28. So people are waiting longer and are therefore more mature.
Again this does not prove causality, but the correlation between the two has strong implications. That's just my feelings on the matter.