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.
Because Mexico has a per capita GDP (nominal) of $11,000+ and a good growth rate of around 4%. Out of about 180 nations, they rank around 55 to 65 in per capita income. Mexico is not poor. but Mexico as a nation is not poor. Mexico has the 14th largest nominal GDP and the 11th largest by purchasing power parity.