because they have nothing else to do
Theadore Roosevelt wrote 18 books
There are dozens of books that list all the presidents with their pictures. Or, you can google "US Presidents" and click on images.
The Presidents Touched it .
Ex-presidents get a substantial pension, so they do not really need to work. Some go back to their law practice. Others give talks and seminars, serve on corporate boards, write books and accept appointment of various kinds.
he did write both
she started to write books in 2001
how many books did the mayan write
He didn't write any books.
incas didn't write books but they wrote on clay
authors write books
Authors write books.
All the US Presidents could write and did so on many occasions.