The network has a series in the works called The Thirteen, set in an alternate twenty-first century where America lost the war. It’ll be interesting to see how precise they get about what actually happened differently in their fictional timeline, assuming the show actually goes into production.
This raises the interesting and question of what alternate event or series of events might have resulted in a British victory. Howe manages to trap Washington in New York? Burgoyne brushes aside the opposition in ’77 and the French decide America is a bad investment? Cornwallis subdues the Carolinas and marches into Virginia unopposed? Quite a few intriguing possibilities.