From Ohio History Central
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By the 1960s and the 1970s, the Lutheran Church in America and the American Lutheran Church began to set aside their differences. Before the two churches officially reunited, they agreed to merge the Hamma School of Theology and the Evangelical Lutheran Theological Seminary together. The new seminary, known as Trinity Lutheran Seminary, opened on September 1, 1978, in Columbus, Ohio. The seminary is part of the Evangelical Lutheran Church in America.