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.
American Slavery. The maritime town of Lagos, Portugal, was the first slave market created in Portugal for the sale of imported African slaves-the Mercado de Escravos, opened in 1444. In 1441, the first slaves were brought to Portugal from northern Mauritania.