What does martin luther king mean by justice-equality of rights , equality before the law , equality of opportunity, equality of economic and social condition, or something else ?

Based on the article posted on January 14, 2017 by Andrea Estrada on the web page named "The Current" Martin Luther King had a dream and it was the dream of equality and justice for the African-American.

What he means by saying  "equality before the law , equality of opportunity, equality of economic and social condition, or something else" That speech, and his exhortation for a society that would judge his children not “by the color of their skin, but by the content of their character,” has become the most common representation of King as a symbol of the fight for racial equality.

lee and grant, both of whom held the highest rank in their respective armies, had known each other slightly during the mexican-american war (1846-48) and began their dialogue by exchanging awkward personal inquiries. characteristically, grant had arrived in his mud-splattered field uniform while lee had turned out in full dress attire, complete with sash and sword.

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