One hundred years ago this week, on June 4, 1919, the U.S. Congress passed the Nineteenth Amendment to the U.S. Constitution, which would guarantee women the right to vote, and sent it on to the states for ratification (which took another 14 months). The battle for women’s suffrage in the United States had been taking place for years—in Congress, in the streets, and at home—with supporters organizing demonstrations, petitions, parades, and speeches, and coordinating with fellow activists in England, France, and other countries. Gathered below, images of some of the brave women who worked tirelessly for years to demand equal rights, and finally succeeded by having them written into law.