Nigeria has a population of 180 million people. UN projections currently suggest that it will have a population greater than the US by 2050, becoming the world's third most populous state. Per capita GDP is currently only $2650. Assuming they go through a developmental transition similar to China and India, there's going to be a tremendous amount of wealth created.
https://en.wikipedia.org/wiki/Nigeria
https://en.wikipedia.org/wiki/Nigeria