We’re living in a transgender moment in America — which is a little odd, when you think about it. For transgender people are not exactly new to the news: The British travel writer James Morris became Jan Morris as long ago as 1972, and the ophthalmologist Richard Raskind became tennis pro Renee Richards in 1975. Nor are they new to American celebrity culture: A young ex-GI named George Jorgensen traveled to Denmark in 1951 and, after surgery, returned home as night-club entertainer Christine Jorgensen.