Historical clue formulations

• Oldest restaurant chain in America, founded in 1919 — 2022-09-16
• Soft drink brand — 2020-01-08
• Root beer brand — 2017-11-27
• Fast-food chain known for its root beer — 2016-11-23
• Classic root beer brand ... or a hint to the answers to this puzzle's starred clues — 2016-10-05
• Competitor of Mug — 2015-05-06
• Big name in root beer — 2011-09-25
• Dad's rival — 2009-06-14
• Fast-food chain known for its floats — 2007-11-24
• Dad's rival — 2005-07-15
• Soft drink name — 1997-09-28
• Rival of Hires — 1994-08-28