ABC News
Gender non-conformity is not a new phenomenon or trend – in fact, gender diversity can be seen throughout history in countries around the world – from ancient Greece to India to the Americas, according to historians. "There is no historically universal way that societies have sorted biologically different people into personhood categories in the way that we do it now," Susan Stryker, a historian and professor, told ABC News in an interview. In America, gender norms enforce that, for example, a person of the female sex will automatically think of themselves as a girl and live socially as a woman, according to Stryker.