RepresentWomen researches and advances the best practices for reaching gender-balanced governance in the U.S. Our research shows that voting systems shape the opportunities women have to run for office and get elected. This timeline accompanies a new brief that analyses the impact of proportional ranked choice voting (PRCV) on women's representation in the United States. Through this timeline, we highlight milestones for women thought leaders and elected officials who have contributed to the ongoing story of PRCV in the U.S. Both the brief and timeline are part of an ongoing series updating our research on voting systems in the U.S. and the impact different systems have on women’s political representation. Previous installments in this series covered voting systems around the world and the impact of ranked choice voting (RCV) on women’s representation.