A tournament held in 1933 at the Chicago World's Fair spurred interest in the game. The Amateur Softball Association (ASA) of America (founded 1933) governs the game in the United States and sponsors annual sectional and World Series championships. The World Baseball Softball Confederation (WBSC) regulates rules of play in more than 110 countries, including the United States and Canada; before the WBSC was formed in 2013, the International Softball Federation filled this role. Women's fastpitch softball became a Summer Olympic sport in 1996, but it (and baseball) were dropped in 2005 from the 2012 Games, to be reinstated in 2016 for the 2020 Games.