Slavery Was Finally Abolished
By this point in time, the United States was not beholden to the British anymore. This is the reason the latter turned to Indigo for all the indigo that it needed. In 1802, only two decades after the war, the dye was no longer a factor in the exportation trade of South Carolina. It was still 63 more years before the abolishment of slavery. The landowners found a different trade in which to exploit the slaves.
The Gullah People
The African slaves who cultivated indigo had been the forebears of the Gullahs. They were the ones who believed in haints and boo rags. It is also this group of people who made the blue even more prominent in the American South. Their descendants have been working to reclaim the importance of color.