Old Louisiana State Capitol the old capitol building. The term "Old State Capitol" in Louisiana is used to refer to the building and not to the two towns that were formerly the capital city: New Orleans and Donaldsonville. The building was added to the National Register of Historic Places on January 12, 1973, and was designated a National Historic Landmark on May 30, 1974. In 1846, the state legislature in New Orleans decided to move the seat of government to Baton Rouge. As in many states, representatives from other parts of Louisiana feared a concentration of power in the state's largest city. In 1840,
Louisiana State Capitol and the remaining territory east of the Mississippi was turned over to Great Britain. The French reclaimed Louisiana from the Spanish in 1803 after the Treaty of San Ildefonso in 1800; the territory was then sold as the Louisiana Purchase to the United States. The ceremonial transfers of Louisiana from Spain to France took place in front of the colonial seat of government, the Cabildo, in November 1803, with the transfer from France to the U.S. occurring there, as well, less than a month later. New Orleans continued to be the location of the capital of the Territory of Orleans,