Seeing as how WWII wasn't the first war in the history of the world, I wonder, how did previous times handle the very same issue, which was men leaving for war and women left to do everything else? Just asking the question, because I think you are on to something, but wondering if the inustrial revolution has played a part as well.
That is an interesting question. Certainly the Industrial Revolution changed the lifestyle of most people. Before this time, most families were farmers. This is why it was extremely rare to find anybody unmarried and even rarer to find families that didn't have more than 7 children. Women needed a man to provide for them because a woman couldn't farm by herself. In turn, she provided him with children who would then work the fields. The more children you had, the easier it would be to farm. But the Revolution changed all of that. Women no longer needed men to provide for them and men no longer needed a wife to bear him children. So the role of marriage changed fundamentally, with people getting married out of love, not necessity. With this change in marriage, people relied more on their feelings, which is a bad concept becauses feelings change. Before, people understood the intrinsic value of 'till death do us part'. But by the 20th century, people could have options. They could wait to get married, date many people before settling, or not get married at all. As a result, we lost the concept of courting in favor of this new idea called "dating."
I do believe WWII sped up the transformation which began with the Industrial Revolution. It was then that women realized they could do everything a man could, so many wanted to stay in the workforce. This also happened during WWI, but was much less pronounced. So Radical Feminism didn't start this process, but it did play a part in the 70's.