It was the spring of 1968 and Donald Trump had it good. He was 21 years old and handsome with a full head of hair. He avoided the Vietnam War draft on his way to earning an Ivy League degree. He was fond of fancy dinners, beautiful women and outrageous clubs. Most important, he had a job in his father’s real estate company and a brain bursting with money-making ideas that would make him a billionaire. “When I graduated from college, I had a net worth of perhaps $200,000,” he said in his 1987 autobiography “Trump: The Art of the...