Historical clue formulations

• The "L" of N.F.L. — 2025-03-03
• American, for example — 2024-01-05
• American ___ — 2022-07-31
• Part of N.H.L. — 2021-06-22
• About three miles — 2020-05-24
• The "L" of N.F.L. — 2019-10-07
• Distance for Captain Nemo — 2019-03-13
• Alliance — 2018-05-01
• The "L" in N.L. or A.L. — 2011-03-21
• Collection of teams — 2008-06-19
• Federation — 2003-01-09
• Part of N.F.L. — 2002-11-11
• Three miles, roughly — 1994-02-08