Final answer:
The Middle Atlantic States have traditionally relied on fertile soils for prosperous farming and production of agricultural products. Other key resources include minerals and forests. Despite changes in industries, the region benefits from a diverse array of natural resources.
Step-by-step explanation:
The key resource in the Middle Atlantic States has historically been its fertile soils, which have supported prosperous farming and the production of a variety of agricultural products. Agriculture has been a bedrock for the economy in this region, leading to a vibrant economy and robust network of towns and cities. However, it's important to note that this region's economy has also been influenced by other natural resources such as minerals, forests for timber and tar, and was historically significant for early oil production. Despite the decline in industries such as coal due to environmental regulations and competition from alternative energy sources, the Middle Atlantic States continue to benefit from their diverse natural resources.