Since women gave birth to the offspring, they were assigned to take care of it. This is how the above mentioned became the domain of men. Women are flexible and inquisitive, and cannot be satisfied with just housework. Part of it is definitely the old pressure of economic underestimation of women's role in society that makes women prove to everybody and themselves that they CAN and WANT to work. But it also is a big change in our turbulent environment that becomes so technologically sophisticated and knowledge demanding that women find more and more niches to implement their skills in.
Differences prove the whole No doubt that men and women are different.
Plus our world's rich history teaches us that only working, sharing, and communicating together can men and women benefit the world. Many old stereotypes get reconsidered. We do not juxtapose two worlds, of men and of women, anymore. The decision of women to work is not an easy one to implement. Part of it is because of stereotyping and reluctance of men to accept women as co-workers.