Constitution of Tennessee
The document was mainly written as a response to the requirement for all ex-Confederate to adopt new constitutions clearly banning slavery. It contains many provisions that are holdovers from the two previous documents. It is much longer than the federal constitution but is not particularly long by the standards of state constitutions.  This 1870 document stood unamended until 1953, which, according to the Tennessee Blue Book, was the longest period that any such document had remained in effect without amendment anywhere in the world.