What's often called 'second-wave' feminism is sometimes dated to begin with the publication of The Second Sex by Simone De Beauvoir in 1949. De Beauvoir herself was critical of that claim later in life; whilst acknowledging that she had some influence on the women's movement that grew in the 1960s, she argued that it had other more pressing, contemporary influences.
It's a long book. Over 700 pages. So why is it worth reading a book long on how women have been treated in philosophy and literature and short on the specifically political? The pre-WW1 British women's suffrage movement is glossed