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.
Slavery in America started in 1619, when a Dutch ship brought 20 African slaves ashore in the British colony of Jamestown, Virginia. Throughout the 17th century, European settlers in North America turned to African slaves as a cheaper, more plentiful labor source than indentured servants, who were mostly poorer Europeans.