Historical clue formulations

• Ancient Central American pyramid builders — 2026-03-09
• New World natives noted for their pyramids and calendar — 2019-12-23
• Settlers of the Yucatán Peninsula — 2018-05-27
• Ancient pyramid builders — 2017-05-04
• Noted calendar makers — 2012-01-29
• Writers of early hieroglyphics — 2000-11-25
• Central American pyramid builders — 1996-12-09