A multi-sport organization, the AAU is dedicated exclusively to the promotion and development of amateur sports and physical fitness programs. It has more than 700,000 members nationwide, including more than 100,000 volunteers.
The AAU was founded on January 21, 1888, by James E. Sullivan and William Buckingham Curtis with the goal of creating common standards in amateur sport. Since then, most national championships for youth athletes in the United States have taken place under AAU leadership. From its founding as a publicly supported organization, the AAU has represented U.S. sports within the various international sports federations. In the late 1800s to the early 1900s, Spalding Athletic Library of the Spalding (company) published the Official Rules of the AAU.
The AAU now serves as the governing body of numerous sports, including basketball, boxing, gymnastics, handball, swimming, diving, water polo, wrestling, weight lifting, track and field, bobsledding, luge, horseshoe pitching, judo, baton twirling, and karate. It also supervises tryouts for Olympic competitors and plays an important role in raising funds for U.S. Olympic athletes. The James E. Sullivan Memorial Trophy, named for an early AAU official, is awarded annually to the nation’s outstanding amateur athlete. Publications include Amateur Athlete (monthly) and sports guides and rule books. Its headquarters is in Indianapolis, USA.
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According to en.wikipedia.org and britannica.com