 After the Illinois Territory was formed in 1809, Indiana's territorial legislature became fearful that the outbreak of war on the frontier could cause an attack on Vincennes, located on the western border of the territory, and made plans to move the capital closer to the territory's population center.Governor Harrison also favored Corydon, a town that he had established in 1808 and where he was also a landowner.Construction on the new capitol building began in 1814 and was nearly finished by 1816, when Indiana became a state.