What do you mean is there a question?
Under is a preposition.
Prepositions are words that indicate location. It tells the location of the subject or object.
Prepositions not only show the actual location of a place but also the location in time.
Some prepositions of an actual location are: in, on, under, above, behind, beside, etc.
Some prepositions of a location in time are: before midnight, after the exams, during winter....
Answer:
Some historians say people decided to preserve their headpieces by hanging them on the wall. Others believe wreaths began to hang on doors to symbolize a victory was achieved in the household.
