Every year
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On December 11, 1816, Indiana was admitted as the 19th state to join the Union when President James Madison signed the congressional resolution. The date was first instituted as a state Holiday in 1925 by the Indiana General Assembly. The Indiana Code directs the governor to issue an annual proclamation to observe December 11 as the day statehood was granted to Indiana by the United States Congress. The law also requires state schools to hold appropriate events to commemorate the event and authorizes public celebrations to be held. Historically the day is commemorated in Indianapolis with speeches and events in the Indiana Statehouse.