Unfortunately this is an answer that would have you fail 3rd grade state standard us history and geography test. Maryland is Southern AND Mid-Atlantic because of its strong mercantile and cultural ties to the middle colonies but historical practice of plantation slavery which ties it to the South. It is not New England, which was historically characterized by Puritanism and full industrialization. After the Civil War, parts of the upper south such as Maryland, Delaware, and arguably Northern Virginia a century later culturally identify much more with the midatlantic than the South. Famous Marylanders include Frederick Douglass, Harriet Tubman, and Thurgood Marshall.