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.
Well over 90 percent of African slaves were imported into the Caribbean and South America. Only about 6 percent of imports went directly to British North America. Yet by 1825, the U.S. had a quarter of blacks in the New World. The majority of African slaves were brought to British North America between 1720 and 1780.he median size of slaveholdings ranged from approximately 25 slaves in the tobacco regions of Maryland, Virginia, and North Carolina, to 30-50 slaves in upland cotton regions. Plantations in the Sea Islands of South Carolina and Georgia and the sugar parishes of Louisiana averaged 60-80 slaves.