On June 2, over 60 percent of registered Mexican voters went to the polls for a monumental election, with over 20,000 public offices up for grabs at the federal and local levels. This election was historic, as a woman was elected to hold the highest office in Mexico for the first time. This transition did not occur naturally; it resulted from consistent, permanent debate at all levels by activists, institutions, academics and women in politics who worked together across party lines to close the political gender gap. Although there is still a long way to go to achieve substantive gender parity in public life, Mexico’s progress can and should be a valuable lesson to the U.S.