Historical clue formulations

• Split decision? — 2026-04-10
• What "marriage is the chief cause of," per Groucho Marx — 2015-12-26
• Possible consequence of cheating — 2015-10-31
• Event occasioning 7-Down — 2013-10-04
• Splitting headache? — 2013-08-08
• Split — 2013-05-16