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 United States is the largest foreign investor in Nigeria, with U.S. foreign direct investment concentrated largely in the petroleum/mining and wholesale trade sectors. U.S. exports to Nigeria include wheat, vehicles, machinery, kerosene, lubricating oils, jet fuel, civilian aircraft, and plastics. Nigeria is eligible for preferential trade benefits under the African Growth and Opportunity Act (AGOA). U.S. imports from Nigeria include crude oil, cocoa, cashew nuts, and animal feed. The United States and Nigeria have a bilateral trade and investment framework agreement. In January 2016, U.S. Secretary of Commerce Penny Pritzker visited Nigeria on a fact-finding mission with senior U.S. business executives who comprised the Advisory Council on Doing Business in Africa.