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.
Listed two years consecutively as Nigeria's richest man, his net worth in 2005 was $1.6 billion, and $4billion in 2006, now he's valued at $8billion in 2007.