Historical clue formulations

• Three unnamed things, in shorthand — 2026-08-19
• ___ Affair — 2018-10-31
• History's ___ Affair — 2016-11-10
• End run of the alphabet — 2016-05-02
• End of a kindergarten run — 2015-12-19
• Run past the W? — 2015-01-23
• End of a school series — 2013-05-09
• Series finale — 2009-02-19
• End of kindergarten? — 2006-10-04
• Series finale — 2005-06-10
• Last letters — 2003-04-23
• ___ Affair — 2001-02-14
• The ___ Affair (1797 imbroglio) — 1999-12-21
• Ending sequence — 1999-03-03
• ___Affair — 1996-07-31
• Child's rhyme finish — 1995-10-26
• The _____ Affair — 1994-11-28
• _____ Affair — 1994-06-20