Before the Civil War, the United States Army did not have or use any standard plans for the construction of a fort or specific military buildings. The Quartermaster Department was responsible for the design, construction, and supply of the US Army forts located in the interior of the United States and on the frontier. The quality of the building construction depended on the ability of the individual quartermaster officer assigned to a specific fort.
Three styles of architecture were used to design the buildings of the fort. The name of each style and its general characteristics are as follows: