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.
GDP per capita (current US$). The latest value for GDP per capita (current US$) in United States was $53,042 as of 2013. Over the past 53 years, the value for this indicator has fluctuated between $53,042 in 2013 and $3,007 in 1960. Definition: GDP per capita is gross domestic product divided by midyear population.