What is the grand source of misery Wollstonecraft deplores?

From the text:

I shall not go back to the remote annals of antiquity to trace the history of woman; it is sufficient to allow that she has always been either a slave, or a despot, and to remark, that each of these situations equally retards the progress of reason. The grand source of female folly and vice has ever appeared to me to arise from narrowness of mind; and the very constitution of civil governments has put almost insuperable obstacles in the way to prevent the cultivation of the female understanding:—yet virtue can be built on no other foundation! The same obstacles are thrown in the way of the rich, and the same consequences ensue.