In 1607, Powhatan teenager Pocahontas first encountered English settlers when John Smith was brought to her village as a captive. In 1920, the ratification of the 19th Amendment gave women the constitutional right to vote. And in 2012, the U.S. Marine Corps lifted its ban on women in active combat, allowing female marines to join the sisterhood of American women who stand at the center of this country's history. Between each of these signal points...