Here is an excerpt:
The Old South, Tate shows, had the only truly European civilization ever known in America. That is in the sense that it was a civilization rooted in its own soil. It was one that produced men who measured their success in life according to non-material standards, perhaps the chief of them being honor. It was an agricultural civilization, and a hierarchical one. That by itself was enough to make Pius or even most ordinary Catholics of the day sympathetic to the South. Certainly the Catholic Bishops of the South were sympathetic. There is no record of any failing to support the Confederacy. One of them, Bishop Patrick Lynch of Charleston, South Carolina, became President Davis’ envoy to Ven. Pope Pius IX . . .
To read the whole essay follow this link: Catholicism and the Old South — Catholicism.org – Saint Benedict Center, The Slaves of the Immaculate Heart of Mary.