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For 'Star-Spangled Banner,' A Long Road From Song To Anthem : NPR »

Francis Scott Key wrote the words to the ballad after witnessing the Battle for Baltimore in 1814. According to author Steve Vogel, after it was published, Key's composition took the country by storm. But it didn't become the national anthem until more than 100 years later. Source Main page (current trends)
More about: Francis Scott Key, Star-Spangled Banner, Steve Vogel