The Women's Rights Movement of the 1960s and 1970s was marked by a renewed push for gender equality and legal reforms. Activists sought to address issues ranging from reproductive rights to workplace discrimination. One pivotal moment in the movement was the publication of a seminal book that framed the struggles of women in a new light and was influential in shaping public discourse. Which influential book, published in 1963, is often credited with sparking the second wave of feminism in the United States?