Historical clue formulations

• Northern neighbor of Namibia — 2026-07-06
• Second-largest Portuguese-speaking country — 2025-06-22
• Neighbor of Zambia and Namibia — 2024-08-28
• Country whose flag features a machete and half of a gearwheel — 2024-05-11
• Country with the second-most Portuguese speakers — 2022-12-21
• Country whose flag depicts a machete — 2022-10-16
• Country whose currency is the kwanza — 2020-06-26
• Portuguese-speaking African nation — 2019-10-27
• African country that's a member of OPEC — 2018-10-25
• OPEC nation since 2007 — 2018-04-13
• Coastal land south of Congo — 2014-09-22
• Luanda's land — 2014-04-24
• Namibia neighbor — 2012-10-07
• Major diamond exporter — 2010-12-05
• Cabinda is an exclave of it — 2009-11-13
• Major diamond exporter — 2008-09-21
• Country north of Namibia — 2008-02-04
• Land bordered by the Congo — 2007-07-06
• Neighbor of Namibia — 2004-06-13
• Luanda's land — 2001-03-25
• Portuguese-speaking land — 2000-08-05
• Neighbor of Zambia — 1998-08-04
• Neighbor of Namibia — 1998-06-24
• Where Luanda is — 1996-04-18
• Portuguese West Africa, today — 1995-09-12
• Portuguese colony until 1975 — 1994-04-08