The two devices used by the poet that support the interpretation that the poem emphasizes oppression are:
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Simile: The comparisons (e.g., "still, like dust, I'll rise" and "still, like air, I'll rise") highlight resilience in the face of oppression.
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Anaphora: The repeated structure in the phrase "But still, ..." throughout the poem emphasizes the speaker's determination to rise above the challenges and oppression faced.
Both devices effectively underscore the theme of resilience against oppression.