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.
Slaves came primarily from Brazil via the Portuguese slave trade from Angola and other Western states in Africa. Once arriving in Buenos Aires, they could be sent as far as Lima, Peru; slaves were provided to Mendoza, Tucuman, Salta Jujuy, Chile, Paraguay, and what is today Bolivia and southern Peru.