Frankin Delano Roosevelt was elected president of the United States four times- he is the only U.S. president who served more than two terms in fice. Two years after Roosevel's death in 1945, Congress passed the Twenty-second Arendment, imiting the president to two terms in office, Until that time, the
tredian of presidents serving only two ters had just been an unwriten rule.
Question
The phrase 'unwitten rule*
(sentence 3) suggests that before 1945