Final answer:
Martin Luther King Jr. used the metaphor of 'quicksand' to highlight the destructive nature of racism and inequality in his famous speech.
Step-by-step explanation:
In his famous speech, Martin Luther King Jr. referred to 'quicksand' to convey the idea that racism and inequality do not provide a solid foundation for society. Just like quicksand, these issues threaten to trap and suffocate progress. By using this metaphor, King emphasized the urgency and danger of inaction, inspiring others to join the civil rights movement and take a stand against injustice.
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