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.
By 1441, the slave trade in West Africa had begun. Slaves were taken to be sold in Europe and were sent to the European colonies in the Atlantic islands to supply the labor on sugar plantations. By the start of the sixteenth century, 200,000 Africans had been transported to Europe and the Atlantic islands.