Where did slavery have the greatest impact in the mid-Atlantic and New England?

While the southern colonies typically get most of the focus during discussions of slavery, every colony had slaves during the beginning of the United States’s history. In the mid-Atlantic, Pennsylvania benefited the most from slavery. While the colony of Pennsylvania was more progressive in terms of its treatment of slaves and enslaved people's potential to gain freedom, it was far and away one of the most agricultural mid-Atlantic colonies. Because of this, it relied on slave labor heavily for its economy.
In the New England territories further north, agricultural was less common, due to the poor quality of the soil, the colder climate, and the smaller land area. However, Massachusetts, being larger than the other northern colonies, was known for its agriculture. Because of this, it utilized slave labor. All of the colonies were impacted by slavery and used slaves to a great extent. However, these two were impacted more than the others in those sections of colonies.