In the history of Presidents of the United States there has been one bachelor President - - (Aaron Sorkin's The American President doesn't count.)
It is James Buchanan ... the fifteenth leader of our nation.
While historians label him as one of our 2 or 3 worst Presidents, due to his inaction with the succession of the southern states leading up to the American Civil War, he did bring along the start of the Pony Express. Making the connections.
"No one is your friend who demands your silence or denies your right to grow." Alice Walker