Historical clue formulations

• Islands west of Lisbon — 2021-06-14
• Archipelago that's a part of Portugal — 2020-09-16
• Archipelago west of Portugal — 2018-04-17
• Santa Maria is one of them — 2014-05-08
• Columbus stopping point of 1493 — 2014-02-27
• Santa Maria's chain — 2012-10-26
• Islands west of Portugal — 2009-03-23
• Native home of the canary — 2009-01-09
• Islands belonging to Portugal — 2003-11-09
• Ponta Delgada is its biggest city — 2003-04-18
• Ponta Delgada's locale — 2002-09-21
• They're Portuguese — 2002-04-27
• Islands off Portugal — 2001-08-22
• Islands off Portugal — 1999-12-30
• Portuguese islands — 1998-02-16
• Islands west of Portugal — 1997-12-23
• Ponta Delgada is its capital — 1995-02-03