The USKA rules for tournament competition are still used today in the United States with only slight variation.
At its height the USKA had more than a half-million members worldwide and, beginning in 1963, conducted an annual national championship competition in the United States.
[1] Trias died in 1989 of cancer, leaving the Shuri-ryu system to his daughter Roberta Trias-Kelley and precipitating a struggle for succession within the USKA.
[3] Both John Pachivas, regional USKA director for the Southeastern US, and George E. Anderson (1931-2009), president of the United States Amateur Karate Federation, produced documents naming themselves as Trias' successor.
[4] After some confusion, David Jordan and James Hawkes, now dead, founded a separate organization (United States Karate Alliance).