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.
Origin of African Slaves Sold in the Triangular Trade. Slaves 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.t is estimated that during the 4 1/2 centuries of the trans-Atlantic slave trade, Portugal was responsible for transporting over 4.5 million Africans (roughly 40% of the total).