Final answer:
The Star Spangled Banner was written by Francis Scott Key and became the national anthem of the United States.
Step-by-step explanation:
The Star Spangled Banner was written by Francis Scott Key. He wrote the lyrics during the War of 1812 and it later became the national anthem of the United States. The song was inspired by the British bombardment of Fort McHenry during the Battle of Baltimore, and Key's experience witnessing the American flag still flying over the fort after the attack.
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