The United States soccer league system consists of three leagues, each with a number of regional divisions.
The league structure in the United States is radically different from that used in almost all the rest of the world, but like most other sports league systems in the United states, in one key respect. There is no system of promotion and relegation between any two levels of the league. Major League Soccer has a fixed number of franchises (currently 12), with no promotion possible from the A-League, which is run by a completely separate entity. The A-League and USL Pro Soccer League are both run by the United Soccer Leagues, but there is no system of relegation, although a formal promotion system has been established. Several franchises have voluntarily moved between those two leagues.
Current System
For each division, its name and number of teams is given:
Soccer, game played by two teams on a rectangular field, in which players attempt to knock a round ball through the opponents’ goal, using any part of the body except the hands.
Soccer is the world's most popular sport, played by people of all ages in about 200 countries.
Soccer differs from other team sports in that there is only one referee, who makes all decisions related to rules.
Soccer, more commonly known internationally as football, has long been one of the most popular recreational sports in the UnitedStates, but professional soccer has been less popular there than in much of the rest of the world.
However, the word "soccer" was beginning to catch on, and the St Louis SoccerLeague was a significant regional competition between 1907 and 1939.
The league structure of soccer in the UnitedStates is significantly different from that used in almost all the rest of the world, in that there is no system of promotion and relegation between lower and higher leagues.