To create a list of women who broke barriers over the last seven decades, 24/7 Tempo reviewed dozens of websites focusing on history, women’s rights, sports, and economics such as britannica.com, womenshistory.org, biography.com, nationalgeographic.com, and espn.com. We reviewed historical articles and biographies of women in various fields, including science, law, sports, the military, business, entertainment, education, activism, and politics. Our list focused on the year a woman accomplished a great feat. Many years have more than one trailblazing woman. We applied editorial discretion in selecting one for every year, giving priority to women who have achieved something for the first time, had an impact in the fight for civil rights, or started a trend that has continued for years.