States in the American Midwest, Northeast, and Mid-Atlantic regions—such as Iowa, Minnesota, Wisconsin, Illinois, Pennsylvania, Ohio, and New York—are most likely to feature full basements. This high prevalence is driven primarily by regional building codes and frost-line depths; builders must excavate deep footings below the deep winter frost line to prevent structural shifting, making it cost-effective to extend the excavation fully into a usable subterranean basement.
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