Please answer the following question: Information:  - H. Allen Brooks (November 6, 1925  August 8, 2010) was an architectural historian and longtime professor at the University of Toronto. Brooks has written on Frank Lloyd Wright and the Prairie School and on the early years of Le Corbusier.  - Chicago (or ), officially the City of Chicago, is the third-most populous city in the United States, and the fifth-most populous city in North America. With over 2.7 million residents, it is the most populous city in the state of Illinois and the Midwestern United States, and the county seat of Cook County. The Chicago metropolitan area, often referred to as Chicagoland, has nearly 10 million people and is the third-largest in the U.S.  - Prairies are ecosystems considered part of the temperate grasslands, savannas, and shrublands biome by ecologists, based on similar temperate climates, moderate rainfall, and a composition of grasses, herbs, and shrubs, rather than trees, as the dominant vegetation type. Temperate grassland regions include the Pampas of Argentina, southern Brazil and Uruguay as well as the steppes of Eurasia. Lands typically referred to as "prairie" tend to be in North America. The term encompasses the area referred to as the Interior Lowlands of Canada, the United States, and Mexico, which includes all of the Great Plains as well as the wetter, somewhat hillier land to the east. In the U.S., the area is constituted by most or all of the states of North Dakota, South Dakota, Nebraska, Kansas, and Oklahoma, and sizable parts of the states of Montana, Wyoming, Colorado, New Mexico, Texas, Missouri, Iowa, Illinois, Ohio, Indiana, Wisconsin, and western and southern Minnesota. The Central Valley of California is also a prairie. The Canadian Prairies occupy vast areas of Manitoba, Saskatchewan, and Alberta.  - The American Foursquare or American Four Square is an American house style popular from the mid- 1890s to the late 1930s . A reaction to the ornate and mass - produced elements of the Victorian and other Revival styles popular throughout the last half of the 19th century , the American Foursquare was plain , often incorporating handcrafted `` honest '' woodwork ( unless purchased from a mail - order catalog ) . This style incorporates elements of the Prairie School and the Craftsman styles . It is also sometimes called Transitional Period . The hallmarks of the style include a basically square , boxy design , two - and - one - half stories high , usually with four large , boxy rooms to a floor , a center dormer , and a large front porch with wide stairs . The boxy shape provides a maximum amount of interior room space , to use a small city lot to best advantage . Other common features included a hipped roof , arched entries between common rooms , built - in cabinetry , and Craftsman - style woodwork . A typical design would be as follows : first floor , from front to back , on one side , the living room and dining room ; while on the other side , the entry room or foyer , stairway and kitchen . Sometimes a bathroom was also included . Second floor , front to back , on one side , bedroom , bathroom and bedroom ; while on the other side , bedroom , stairway and bedroom . The bedrooms had a slightly longer dimension along the front and back of the house with side by side closets between the bedrooms . This gave a very efficient layout with a bedroom in each corner and a centralized bathroom and stairway . The top floor was generally just a big open space with one to four dormers . The basement generally contained a large natural convection furnace or boiler .  - 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.    What entity does 'american foursquare' has the relation 'instance of' with?
A:
architectural style