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 Census Bureau of the United States, the population of Nigeria will reach 402 million people by the year 2050. With those numbers, Nigeria will become the third most populated country in the entire world, surpassing the United States in the near future.