Historical clue formulations

• African country that's another African country minus its final two letters — 2026-05-19
• African country whose name is found in another country's name — 2025-06-08
• Landlocked African country — 2024-12-30
• Neighbor of Mali — 2023-01-02
• Media exec Robert — 2021-08-26
• Niamey's land — 2018-07-22
• Major exporter of uranium — 2018-07-15
• Third-longest river in Africa — 2017-08-05
• French-speaking African land — 2015-07-08
• Land bordering Lake Chad — 2014-12-10
• French-speaking African nation — 2014-10-06
• Big uranium exporter — 2013-05-11
• Third-longest river in Africa — 2011-05-05
• Where Hausa and Djerma are spoken — 2010-11-26
• Neighbor of Chad — 2010-11-10
• River on the Benin border — 2010-08-01
• Neighbor of Chad — 2008-05-04
• Land that's more than 90% desert — 2008-03-27
• Neighbor of Chad — 2007-08-12
• Timbuktu's river — 2007-02-07
• Land on Lake Chad — 2006-07-30
• Uranium-exporting country — 2006-02-26
• River through Mali — 2005-08-07
• Chad toucher — 2004-03-07
• West African river — 2003-12-15
• Big uranium exporter — 2003-05-18
• Chad toucher — 2002-12-28
• Francophone land — 2002-04-07
• River to the Gulf of Guinea — 1999-08-13
• Africa's third-longest river — 1999-05-31
• Country west of Chad — 1998-05-04
• African river — 1997-09-03
• Neighbor of Chad — 1996-05-25
• Neighbor of Chad — 1995-10-31
• Africa's third-longest river — 1995-10-16
• Neighbor of Chad — 1994-09-19
• Niamey's country — 1994-06-30
• Neighbor of Chad — 1993-12-23