Establishment and early history
The first fraternity in North America to incorporate most of the elements of modern fraternities was Phi Beta Kappa, founded at the 展开

Demographics
There are approximately nine million student and alumni members of fraternities and sororities in 展开

• Active – an initiated, undergraduate student member of a fraternity or sorority.
• Alumni/Alumna/Alumnus – a member of a sorority or fraternity who is no longer an undergraduate student and no longer resides in the house. 展开

• Caitlin Flanagan, "The Dark Power of Fraternities," The Atlantic, March 2014, pp. 72–91.
• John … 展开

Gender exclusivity
Fraternities and sororities traditionally have been single-sex organizations, with fraternities consisting exclusively of men and sororities consisting exclusively of women. In the United States, fraternities and sororities have a … 展开

Homogeneous membership and elitism
Greek letter organizations have often been characterized as elitist or exclusionary associations, organized … 展开

• Alumni association
• Collegiate secret societies in North America
• Defunct North American collegiate sororities
• High school secret societies 展开