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 obtained from the Muslim dominated North African coast however proved to be too well educated to be trusted and had a tendency to rebellion. See The Role of Islam in African Slavery for more about Slavery in Africa before the Trans-Atlantic Trade began.laves for the Trans-Atlantic slave trade were initially sourced in Senegambia and the Windward Coast. Around 1650 the trade moved to west-central Africa (the Kingdom of the Kongo and neighboring Angola). The transport of slaves from Africa to the Americas forms the middle passage of the triangular trade.