Historical clue formulations

• Embankments protecting New Orleans — 2026-03-31
• Big banks — 2026-01-10
• River embankments — 2018-08-20
• Current resisters — 2006-09-03
• Bank deposits? — 2002-09-14
• Some banks — 1998-04-08
• They protect banks — 1996-11-24
• Overflow controls — 1996-03-03