Historical clue formulations

• Sports org. with the Pittsburgh Maulers and Philadelphia Stars — 2022-04-03
• Defunct org. in which Donald Trump owned the New Jersey Generals — 2017-11-05
• Defunct sports org. with the Denver Gold and Chicago Blitz — 2011-05-13
• Group that included the L.A. Express — 2007-03-24
• Org. for the Denver Gold and Chicago Blitz — 2005-01-22
• Defunct gridders' org. — 2004-12-14
• Defunct sports grp. — 1994-09-10