The decades-long, trillion-dollar love affair between China and Wall Street is coming to an end. Didi Chuxing, a $39 billion company that is China’s answer to Uber, said on Friday that it would delist its shares from the New York Stock Exchange. Just six months ago, Didi was a Wall Street darling, raising billions of dollars from American pension funds and international investors in a splashy New York initial public offering. Those sorts of deals once fueled a three-decade relationship that helped reshape the global political and financial landscape. China generated heaps of money for Wall Street by hiring banks...