Some acronyms for U.S. Pro Soccer would include the USSF which stands for the United States Soccer Federation and there are also three professional soccer league divisions under the United States Soccer Federation. Division I, the strongest and highest division, is made up of teams from MLS or Major League Soccer. Division II is made up of teams from the NASL or the North American Soccer League. Division III, the weakest and lowest division, is made up of teams from the USL Pro, or United Soccer Leagues Professional Division.
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