USFL files trademarks for National Spring Football League amidst merger reports : r/xfl
What is the USFL? Details, history, potential teams for 2022 return of spring football league
United States Archives - American Football International
Pro football leagues XFL and USFL announce intent to merge
XFL and USFL announce intent to merge beginning in 2024 season, unifying spring football leagues
XFL Archives - Page 2 of 5 - American Football International
USFL, XFL announce intent to merge
Will the USFL be back next season? League set to return in 2023, face off against XFL