My hunch was KA, given that they were founded in December 1865. As recently as the 1980's, the chapter at my campus was still holding an annual Nathan Bedford Forrest Day, to celebrate the Confederate General. In addition to being a hero of KA, Forrest was also a well-known proponent and member of the KKK. And their annual spring formal was called "Old South" -- some of the brothers actually dressed up in Confederate uniforms and encouraged their dates to dress in frilly hoop skirts a la Scarlett O'Hara.
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