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 GDP per capita in Sudan is $2,600 while in The United States it is $52,800. This entry shows GDP on a purchasing power parity basis divided by population as of 1 July for the same year.