Prairie School was a late 19th- and early 20th-century architectural style, most common to the Midwestern United States. The style is usually marked by horizontal lines, flat or hipped roofs with broad overhanging eaves, windows grouped in horizontal bands, integration with the landscape, solid construction, craftsmanship, and discipline in the use of ornament. Horizontal lines were thought to evoke and relate to the native prairie landscape. The term Prairie School was not actually used by these architects to describe themselves (for instance, Marion Mahony used the phrase The Chicago Group); the term was coined by H. Allen Brooks, one of the first architectural historians to write extensively about these architects and their work.