The early (WWI/WWII) feminist movements did in fact lead to women entering the voting system, this can namely be attributed to men going off to war and seeing a large increase in the amount of women working in factories and having to perform the duties of the men who where absent.

However women have been working (for significantly less than men (in the industrial revolution)) since the industrial revolution when the need for workers sharply increased in Britain. So to answer the question, the feminist movement cannot lay claim to getting women into the workforce. A better claim would be that the Feminist movement lead to political reformation and female suffrage. The feminist movement also lead to rises in the minimum wage for women and men.

I have wondered how influential the pill was in freeing women to pursue careers. My logic leads to comments made in the book "The birth of the pill" by Jonathan Eig about how really, stopping women from having babies allowed them to pursue other avenues in life, like a career.