Historical clue formulations

• Wisc. neighbor — 2026-03-29
• State whose northern residents are known as Yoopers: Abbr. — 2021-04-15
• Lansing's home: Abbr. — 2014-12-29
• Pontiac's place: Abbr. — 1999-07-02
• State north of Ind. — 1997-06-02
• Neighbor of 9-Down — 1993-12-18