Nigeria

Nigeria’s economy is the largest in Africa and the 31st largest in the world by nominal GDP.

An excerpt from the article 19 facts about Nigeria

It is an energy powerhouse in Africa (the 15th largest oil producer in the world, the 6th largest exporter, and the 9th largest country with proven reserves), as well as a leader in the financial, pharmaceutical, and entertainment markets. More than 23 percent of Nigeria’s GDP comes from agriculture, forestry, and fishing.

Nigeria is the world’s largest producer of cassava. The country’s main agricultural export and one of its most important non-oil products is cocoa. Nigeria is also one of the world's top 20 exporters of natural rubber.