On this date in 1816 President James Madison signed the act admitting Indiana to the Union as the 19th state.
IC 1-1-10-1 Proclamation; observance
Sec. 1. The governor shall issue a proclamation annually designating the eleventh day of December as Indiana Day, and in pursuance thereof suitable exercises, having reference to the historical event to be commemorated thereby, may be held in the public schools of the state, and by citizens generally throughout the state, in appropriate and patriotic observance of the anniversary of the admission of the state of Indiana into the Union.