What was the significance of the Sahel region for commerce and trade in Africa?
In what modern African nation was the Kingdom of
Kanem-Bornu located?

Explanation:

The Kanem–Bornu Empire existed in areas which are now part of Chad and Nigeria. It was known to the Arabian geographers as the Kanem Empire from the 8th century AD onward and lasted as the independent kingdom of Bornu (the Bornu Empire) until 1900. The Kanem Empire (c. 700–1380) was located in the present countries of Chad, Nigeria and Libya.[2] At its height it encompassed an area covering not only most of Chad, but also parts of southern Libya (Fezzan) and eastern Niger, northeastern Nigeria and northern Cameroon. The Bornu Empire (1380s–1893) was a state in what is now northeastern Nigeria, in time becoming even larger than Kanem, incorporating areas that are today parts of Chad, Niger, Sudan, and Cameroon. The early history of the Empire is mainly known from the Royal Chronicle or Girgam discovered in 1851 by the German traveller Heinrich Barth.

c

explanation:

i think it is the byzantine empire