When was "The Star Spangled Banner" officially adopted as the National Anthem?

The official adoption of "The Star Spangled Banner" as the National Anthem of the United States occurred on March 3, 1931. This significant event established the song, originally penned by Francis Scott Key during the War of 1812, as a symbol of national pride and unity. The song's powerful lyrics and connection to an important moment in American history resonated strongly with the public, leading to its formal recognition.

The other dates provided have historic significance but do not pertain to the anthem's official designation. For example, July 4, 1776, marks the adoption of the Declaration of Independence, while September 14, 1814, is the date after the Battle of Fort McHenry when Key wrote the poem that would later become the anthem. April 21, 1789, represents another important date in U.S. history, related to the inauguration of George Washington, but it is not linked to the national anthem.