The Anacreontic Song
The combination of Key's poem and Smith's composition became known as "The Star-Spangled Banner" , which was adopted as the national anthem of the United States of America in 1931 . 
<triplet> The Star-Spangled Banner <subj> national anthem <obj> instance of <subj> United States of America <obj> country <triplet> United States of America <subj> The Star-Spangled Banner <obj> anthem