Hall of States and Federal Buildings, Chicago Worlds Fair Architects rendering of the Hall of States and the Federal Building of Chicagos 1933 Worlds Fair. A Century of Progress International Exposition. The buildings are erected in juxtaposition, to symbolize the essential unity of the federal and state governments. The Hall of States which houses exhibits of the various states and territories, is a great horseshoe shaped structure, two stories high, 500 feet across at the base and with its two arms 500 feet long and 140 feet wide at the widest point. The open part of the horseshoe faces west and encloses a court, landscaped and containing a sunken garden with a triangle pool. Across the base of the horseshoe extends the Federal Building, housing exhibits of the United States government. This building is 620 feet long by 300 feet wide, with a rotunda seventy feet in diameter and surmounted by a 75-foot dome, rising from its center. Arranged around this dome are three 150-foot towers, triangular in section, representing the three branches of government, administrative, legislative and executive.