California United FC intended to join the North American Soccer League (NASL) as an expansion franchise for the 2018 season. However, due to the instability of the league, California United withdrew its franchise agreement from NASL in early 2018 and announced that it was exploring all professional league options for the 2019 season. On November 15, 2018, the club was announced as a participant in the 2019 NPSL Founders Cup and as a founding member of a new league to being in 2020.
