There is an extensive series of horse shows in the United States and Canada for Arabian, Half-Arabian, and Anglo-Arabian horses, sanctioned by the USEF in conjunction with the Arabian Horse Association. Classes offered include Western pleasure, reining, hunter type and saddle seat English pleasure, and halter, plus the very popular "Native" costume class. "Sport horse" events for Arabian horses have become popular in North America, particularly after the Arabian Horse Association began hosting a separate Arabian and Half Arabian Sport Horse National Championship in 2003 that by 2004 grew to draw 2000 entries. This competition draws Arabian and part-Arabian horses that perform in hunter, jumper, sport horse under saddle, sport horse in hand, dressage, and combined driving competition.