Historical clue formulations

• Combine — 2021-11-19
• Tie the knot — 2021-10-03
• Settle down, say — 2021-05-09
• Unite — 2020-09-11
• Unionize? — 2013-07-14
• Wed — 2009-10-07
• Hook up with — 1996-09-25
• Get hitched — 1996-05-06
• Take the plunge — 1993-12-27