The Swahili language was a language that was actually very well in connecting people from different places, and it was a language that enabled communication between lots of people from different backgrounds. The Swahili language is actually a language that has its basis in the Bantu, but over time, because of the constant communication with lots of people that came in this part of Africa to trade, the language incorporated lots of words and phrases from other languages, so it became a mixed language that lots of people started using for mutual communication.
I am pretty sure the the South was more industrial than the North because in the North they mostly got goods from the South because there in the South is were farmers grew there crops. I hoped this helped you understand even though I couldn’t really explain it well. I learned this in 5th grade so I tried my best to remember what they taught me.