Non-renewable resources are resources for which there is a limited supply. The supply comes from the Earth itself and, as it typically takes millions of years to develop, is finite. Non-renewable resources can generally be separated into two main categories; fossil fuels and nuclear fuels.
But there were pockets of the North on the eve of the Revolution where slaves played key roles in the economic and social order: New York City and northern New Jersey, rural Pennsylvania, and the shipping towns of Connecticut and Rhode Island.
The majority of the slave trade was conducted along the West african coast in what is the coastal areas of the modern african countries of Senegal, Gambia, Guinea, Ivory Coast, Cameroun, Nigeria, Benin, Sierre Leone, Togo, Ghana, Congo and Angola.