请用英语概述马丁·路德·金的《我有一个梦想》的演讲内容，回答不超过150个单词，要求包含4个要点
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Martin Luther King's "I Have a Dream" speech is a powerful call for racial equality and justice. The key points are:

1. **Racial Equality**: King emphasizes the need for an end to segregation and racial discrimination.
2. **Color-Blind Society**: He envisions a future where people are judged by their character, not by the color of their skin.
3. **Legacy of Slavery**: King references the promises made to slaves and calls for their fulfillment.
4. **Dream of Unity**: He articulates a dream of a unified America where all people, regardless of race, can join hands and live out the true meaning of its creed.
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