What is the figurative language and central idea of this part of story plz help Every Voice and Sing
By James Johnson
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Lift ev'ry voice and sing,
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Till earth and heaven ring,
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Ring with the harmonies of Liberty;
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Let our rejoicing rise
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High as the list'ning skies,
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Let it resound loud as the rolling sea.
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Sing a song full of the faith that the dark past has taught us,
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Sing a song full of the hope that the present has brought us;