Even worse, it took the U.S. government until 1998 to repudiate slavery!
Don't try to convince me that the Emancipation Proclamation, the Thirteenth through Fifteenth Amendments, and various civil rights legislation of the 19th and 20th centuries indicate that the United States had substantially repudiated slavery long before President Clinton's 1998 apology. That would be like arguing that the fact that the Catholic Church began teaching heliocentrism in its schools in the 17th century and never looked back, or that the Church was sponsoring the publication of Galileo's pertinent works again by the first half of the 18th century, indicate that the Church had substantially repudiated the Italian Inquisition's condemnation of Galileo long before Pope John Paul II's 1992 apology.