And when this happens, when we allow freedom to ring, when we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children,

from Martin Luther King, Jr – I Have A Dream on Rap Genius

Meaning

If the blacks are freed and treated equally, this will be a step towards everyone in the world being treated equally. King does a good job of making this issue important to even the people who couldn’t care less about blacks in this statement

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