The question is talking about the Songhai Empire, this State was located in the Western part of Africa and has been one of largest states of the continent's history. Like the question points down, the Songhai Empire was wealthy thanks to the commerce of valuable goods and the control of the Trans-Saharan trade rout, and it was highly influenced by the Islamic culture and religion. Unfortunately, the royal descendants fought against each other to be the next ruler, and while doing that they were invaded by Morocco, which meant the decline and end of the Songhai Empire.
