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Answer:
The speaker shows that his soul has grown deep like rivers when he recounts the experiences that connect him to his heritage.
The way in which the speaker backs the idea of his "soul growing deep like rivers" would be:
"The Negro Speaks of Rivers"
In the poem, the speaker employs simile to establish a comparison between the depth of 'his soul' and 'heritages of the earth' i.e. 'river.'
He states this claim to show that he has engrossed the history and heritage into his soul the way river engross.
This implies that the way he has deeply understood them is similar to the rivers which convey his internalization of the ancient history of human civilization and existence.
Learn more about "Langston Hughes" here:
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