Federal Style, in architecture, the dominant phase of formal neoclassicism in the United States, reaching its peak in the New England and Middle Atlantic states between 1780 and 1820. Some typical features of the style are elliptical fanlights; oval interiors; circular, freestanding stairs; freestanding porticoes framed by columns; small, delicate moldings; and slender proportions. The term Federal style also refers to furniture of the period; the designs were classically inspired and often featured marquetry and veneering. Mahogany was a popular wood for Federal furniture, and pieces were often inlaid with a contrasting wood. See American Art and Architecture; Georgian Style; Neoclassical Art and Architecture.