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.
THE SPREAD OF SLAVERY IN THE U.S. Not long after Columbus set sail for the New World, the French and Spanish brought slaves with them on various expeditions. Slaves accompanied Ponce de Leon to Florida in 1513, for instance. But a far greater proportion of slaves arrived in chains in crowded, sweltering cargo holds.