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 to the Southern Colonies to primarily farm tobacco, as did plantation owners also came to these colonies. Slaves were shipped here for a larger work force. Indentured servants came because the people living in these colonies persuaded them to come from England.