The theological institution Columbia Theological Seminary is affiliated with was established with a merger in what year?
Columbia Theological Seminary:  It is one of ten theological institutions affiliated with the Presbyterian Church (USA). Presbyterian Church (USA):  The PC(USA) was established by the 1983 merger of the Presbyterian Church in the United States, whose churches were located in the Southern and border states, with the United Presbyterian Church in the United States of America, whose congregations could be found in every state.
1983