Which Songhai city was the center of learning,trade and religion

http://thesalmons.org/lynn/wh-timbuktu.html

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Tombouctou.

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The Songhai city that was known as the center of learning, trade, and religion was Timbuktu. Timbuktu, located in present-day Mali, was a prominent cultural and economic hub during the height of the Songhai Empire in the 15th and 16th centuries.

To find this answer, one could start by researching the Songhai Empire and its major cities. Once you have identified the empire's significant cities, you can narrow down the options by looking for mentions of trade, religion, and learning associated with those cities. In this case, Timbuktu is well-known for its history and reputation as a center of Islamic scholarship, commerce, and trans-Saharan trade routes, making it the most likely answer.