European and North American figure skaters rarely competed against each other because of differences in their styles of skating. The ISU had "systematized and arranged" the sport of figure skating, with competitions including "a selection of ten or twelve numbers from the I. S. U. programme, ... five minutes' free skating to music, ... special figures" on one foot. In 1911, Canada joined the ISU, leaving the United States as the only major competitor to not be a member. This changed in 1923, when the United States Figure Skating Association joined the ISU and in 1926, the Japanese sport governing body followed to acquire ISU membership.