Historical clue formulations

• Nigerian people in "Things Fall Apart" — 2023-08-04
• Nigerian tribe — 2018-01-11
• Author Chinua Achebe, by birth — 2016-03-04
• Nigerian people — 2012-05-26
• Nigerian language — 2012-05-05
• Native Nigerian — 2011-08-31
• Nigerian language — 2010-12-11
• Writer Chinua Achebe, by birth — 2010-01-14
• Nigerian native — 2009-09-25
• Nigerian native — 2009-08-03
• Nigerian native — 2008-12-13
• Nigerian native — 2006-12-12
• Nigerian language — 2006-10-25
• Nigerian tribesman — 1999-06-10
• Nigerian people — 1999-05-27
• Nigerian tribesman — 1998-07-22
• Native Nigerian — 1996-10-24
• Nigerian language — 1996-01-10
• Nigerian native — 1996-01-04