Indoor soccer was a great success in the 1980s to the '90s, in part due to the input of the North American Soccer League. When the NASL folded, other leagues, including the Major Indoor Soccer League filled in to meet the demand. A new MISL exists today with seven teams operating in the 2013–2014 season. However, it is unrelated to the original MISL. The highest level of soccer in the United States is Major League Soccer, formed as a result of the U.S. hosting the 1994 FIFA World Cup.