<Li> 1814 September 14 -- Francis Scott Key writes the four stanza poem `` The Star - Spangled Banner '' . It officially becomes the U.S.A. national anthem in 1931 . The unique 15 - star , 15 - stripe design with a red stripe under the blue canton with stars ( used 1795 - 1818 ) of the huge flag made by Mary Young Pickersgill later seen by Key flying over Fort McHenry outside Baltimore in September 1814 during the Battle of Baltimore in a British land / sea attack becomes known as the `` Star Spangled Banner Flag '' . </Li>
<Li> 1814 September 14 -- Francis Scott Key writes the four stanza poem `` The Star - Spangled Banner '' . It officially becomes the U.S.A. national anthem in 1931 . The unique 15 - star , 15 - stripe design with a red stripe under the blue canton with stars ( used 1795 - 1818 ) of the huge flag made by Mary Young Pickersgill later seen by Key flying over Fort McHenry outside Baltimore in September 1814 during the Battle of Baltimore in a British land / sea attack becomes known as the `` Star Spangled Banner Flag '' . </Li>
when did the star spangled banner offically become the national anthem
when did the star spangled banner offically become the national anthem
1931
1931