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.
The nominal GDP is the value of a country's GDP that is calculated at the current price level. Since the nominal GDP isn't adjusted for inflation, it doesn't necessarily accurately reflect the economic strength of an economy over time because the increase may be due to inflated prices rather than increased output.