It is not that people are making not enough money. It is prices in US are insane, especially housing.
https://www.numbeo.com/property-investment/rankings_by_count...
According to the census data, only 20% of US households spend 40% or more of their income on housing. That goes down to 13% for home owners.
https://usafacts.org/data-projects/housing-costs
My stats (the property price index) are for property prices. It would be unsurprising if Nigerian home ownership rates are lower than US rates.