https://en.m.wikipedia.org/wiki/Southern_Baptist_Convention

The Southern Baptist Convention (SBC), alternatively the Great Commission Baptists (GCB), is a Christian denomination based in the United States. It is the world's largest Baptist denomination, and the largest Protestant and second-largest Christian denomination in the United States.[1][2] In 1845 the Southern Baptists separated from the Triennial Convention in order to support slavery, which the southern churches regarded as "an institution of heaven".[3][4] During the 19th and most of the 20th century, it played a central role in Southern racial attitudes, supporting racial segregation and the Lost Cause of the Confederacy while opposing interracial marriage. In 1995, the organization apologized for its history.[6] Since the 1940s, it has spread across the United States, having member churches across the country and 41 affiliated state conventions.

https://en.m.wikipedia.org/wiki/Triennial_Convention

The Triennial Convention (so-called because it met every three years) was the first national Baptist denomination in the United States. Officially named the General Missionary Convention of the Baptist Denomination in the United States of America for Foreign Missions, it was formed in 1814 to advance missionary work and headquartered in Philadelphia, Pennsylvania. In a dispute over slavery and missions policy, Baptist churches in the South separated from the Triennial Convention and established the Southern Baptist Convention in 1845. This split left the Triennial Convention largely Northern in membership. In 1907, the Triennial Convention was reorganized into the Northern Baptist Convention, which was renamed American Baptist Churches USA in 1972.