Answer :
The reason behind Francis Scott Key's Star-Spangled Banner is the war of 1812.
On September 14, 1814, American soldiers at Fort McHenry in Baltimore raised a giant American flag to commemorate a decisive victory over British forces during the War of 1812. Inspired by the "wide stripes and glittering stars," Francis Scott Key created a song that became the national anthem of the United States.
During the War of 1812, Francis Scott Key was inspired to create "The Star-Spangled Banner" after seeing the British shelling of the Maryland fort. A lone American flag was flapping above Fort McHenry, which Key noted. And the red brightness of the rockets and bombs bursting in the air reaffirmed throughout the night that our flag, as symbolized in the anthem's words, was still there.
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