“The Star-Spangled Banner” becomes official adopted “congressional resolution” adopted 1931 Act adopted It became our country's national anthem in 1931. adopted until 1931 it was on March 3, 1931 adopted adopted wasn’t even adopted as the national anthem until 1931 adopted adopted More info This Day in History: March 3, 1931 More info “The Star-Spangled Banner” becomes official This Day in History: March 3, 1931 The History Channel becoming the main anthem