The United Soccer Leagues is the organizer of several soccer leagues with teams in the United States, Canada and the Caribbean. It includes men's and women's leagues, both professional and amateur. Leagues currently organized are the USL Pro, the USL Premier Development League, the W-League, and two leading youth leagues, the Super-20 League and Super Y-League. As of 2011 it has also assumed the operations of the Major Indoor Soccer League. It is directly affiliated with the United States Soccer Federation, the United States Adult Soccer Association and the Canadian Soccer Association. There is no promotion and relegation in US soccer. read more