Does Fences, set in 1957, still have relevance for the 21st century?

Yes, August Wilson's play Fences absolutely still has relevance in the 21st century. The setting of the play, in 1957, allows Wilson to explore how racial discrimination and oppression at the time impact the main characters; however, we must admit that racial inequity is still a problem in the United States in the 21st century, even if the context is not exactly the same as the setting of the play.
Further, the play is still relevant because it investigates universal themes and issues that readers in different time periods and places can relate to. The two main themes that I see in the play are the effects of dashed dreams and the difficulties of family dynamics. These are intertwined in Wilson's play, as Troy's disappointment with his life, namely with his athletic career, causes him to project anger onto his family, especially his son, Cory. Troy's wife, Rose, also suffers as a result of Troy's bitter demeanor. He feels like he is the one who has had to give up on his dreams to support a family, but she reminds him that she has been with him throughout it all. Troy does not seem to appreciate the sacrifices his wife makes and focuses only on himself. Troy also has extramarital affairs and ends up impregnating one of his mistresses. After his death, Rose helps to care for the little girl, which is an interesting take on forgiveness and family. The story of the Maxson family is poignant and realistic; it is a human story, with flawed relatable characters with whom readers now and in the future will still be able to connect.