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.
1 Indentured Servants in America. In Colonial America, indentured slaves did not only consist of Africans, but a large majority of them were Irish, Scottish, English, and Germans, who were brought over from Europe and were paying their debt for the passage over sea.  Anthony Johnson.