Engineers, who were the leaders of the Underground Railroad, helped slaves who were running away by providing them with food, shelter, and sometimes jobs. They hid the slaves from people who were trying to catch them and return them to slavery.
The GDP per Capita, in Nigeria, when adjusted by Purchasing Power Parity is equivalent to 32 percent of the world's average.
According to the study there are 23 job categories with different salary rates. According to the estimates, the average yearly salary in Nigeria is 658,324 NGN (USD3,596), with the maximum of 5,000,000 NGN (USD27,320) and the minimum of 37,000 NGN (USD202).