"'O say can you see' begins one of the most recognizable songs in the United States. Originally a poem by Francis Scott Key, the national anthem tells the story of the American flag rising high above a fort after a night of intense battle during the War of 1812. But there's so much more to the story than what is sung at ballgames. What was this battle about? Who sewed those broad stripes and bright stars? Why were free black soldiers fighting on both...