The United States Code is the codification by subject matter of the general and permanent laws of the United States. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives.
The reason you are referring to the code book is that you can't point to the law which you presume to be codified in that book.
By the way, what of the male descendants of Lafayette? I didn't see it on your list. If the code book failed to include it does it mean that the law has been repealed by the code book author?