The NISL was founded in 1975 .
The NISL was has become one of the largest and most competitive youth soccer leagues in the United States with over 17,000 players on more than 1,300 teams throughout Chicago - land .
The NISL was founded in 1975 and has become one of the largest and most competitive youth soccer leagues in the United States with over 17,000 players on more than 1,300 teams throughout Chicago - land .