USFL announces teams for upcoming 2022 season
United States Football League (2022) - Wikipedia
USFL files trademarks for National Spring Football League amidst merger reports : r/xfl
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USFL files trademarks for National Spring Football League amidst merger reports : xfl
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Did USFL hint at teams relocating with new trademarks?
Washington Redskins: 1937–2020
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