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the last line of the refrain in that poem reflects the universal theme brotherhood in America.
Francis Scott Key penned a poem on September 14, 1814, which was eventually adapted to music and became "The Star-Spangled Banner," America's national song, in 1931. Originally titled "The Defense of Fort M'Henry," the poem was composed by Key after he saw the British bombard the Maryland fort during the War of 1812. As reflected in the now-famous lyrics of the "Star-Spangled Banner," Key was inspired by the sight of a single American flag still flying over Fort McHenry at dawn: "And the rocket's crimson glow, the bombs bursting in air, Gave confirmation through the night that our flag was still there."
To know more about Universal theme refer :
brainly.com/question/1619342
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