Answer: Martin Luther King in this passage means that he wants his kids/everyone to be judged by what their personality is like and not their skin color.
I think It means what it says that he wants his kids or kids in general to live in a world where you are not judged by the color of your skin judged because of your character. I don't think it could be any easier to understand.
The Civil Rights Movement is an umbrella term for the many varieties of activism. Despite the abolition of slavery and legal gains for African Americans, racial and freedom was the largest civil rights protest in US history.