The title of A History of Borno, Trans-Saharan African Empire to Failing Nigerian State has two ambiguities. Situated in the Sahel, Borno did not span the Sahara. It was Trans-Saharan by being linked culturally and economically to the Mediterranean and the Red Sea, rather than to the Atlantic. Whether the failing state is Nigeria or Borno is also unclear.
Mark Goldie has been one of the most influential interrogators of England in the later 17th and early 18th centuries.