European and North American figure skaters rarely competed against each other due to differences in their styles of skating.[19] The ISU had "systematized and arranged" the sport of figure skating,[19] with competitions including "a selection of ten or twelve numbers from the I. S. U. programme, ... five minutes' free skating to music, ... [and] special figures" on one foot.[17] In 1911, Canada joined the ISU, leaving the United States as the only major competitor to not be a member.[19] This changed in 1923, when the United States Figure Skating Association joined the ISU[20] and in 1926, Japanese sport governing body followed to acquire the membership.[21]