What is the USFL? Details, history, potential teams for 2022 return of spring football league
XFL, USFL confirm intention to merge into single spring football league
XFL and USFL announce intent to merge beginning in 2024 season, unifying spring football leagues
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From USFL to AAF: A History of Spring Football - Football Stadium Digest
USFL announces return of spring football league, set to play in 2022