What language began as a trade language in Sub-Saharan Africa and is now the most widely used language in the region?

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Swahili began as a trade language in Sub-Saharan Africa, particularly along the East African coast, and has since become the most widely spoken language in the region. It is estimated to have over 100 million speakers, spread across various countries including Kenya, Tanzania, Uganda, Rwanda, Burundi, and the Democratic Republic of Congo.

What Language Began as a Trade Language in Sub-Saharan Africa