The USL Championship (USLC) is a professional men's soccer league in the United States that began play in 2011. The USL is sanctioned by the United States Soccer Federation (USSF) as a Division II league since 2017, placing it under Major League Soccer in the hierarchy. The USL is headquartered in Tampa, Florida. The league is owned and operated by the United Soccer League and was formed from a merger of their USL First (USL-1) and Second Divisions (USL-2) following the 2010 season.
https://en.wikipedia.org/wiki/USL_Championship