NEW YORK — No scripts have been written, not even an outline.

But HBO’s announcement on Wednesday that the creator-showrunners of “Game of Thrones” will follow up that massive hit with an HBO series in which slavery remains legal in the modern-day South drew fire on social media from those who fear that telling it will glorify racism.

The series, “Confederate,” will take place in an alternate timeline where the Southern states have successfully seceded from the Union and formed a nation in which legalized slavery has evolved into a modern institution. The story follows “a broad swath of characters on both sides of the Mason-Dixon Demilitarized Zone,” HBO said – “freedom fighters, slave hunters, politicians, abolitionists, journalists, the executives of a slave-holding conglomerate and the families of people in their thrall.”

“Confederate” will be created and written by “Game of Thrones” masterminds David Benioff and D.B. Weiss, who will also serve as showrunners on the series. Both are white.

HBO’s announcement also said they would join forces with Malcolm Spellman (“Empire,” the forthcoming “Foxy Brown”) and Nichelle Tramble Spellman (“Justified,” “The Good Wife”), husband-and-wife TV veterans who both are black and who will be executive producers and writers on the new series.

“This is not going to be, you know, the big ‘Gone With the Wind’ mansion,” Nichelle Tramble Spellman said in an interview Thursday to address the backlash. “