In the 1880's segregation was a big thing. White people didn't allow black people in certain stores, playgrounds, movie theaters, etc.
Most people were sick of it, especially Martin Luther King. So many black people were being judged and were called slurs. It was very unfair.
Martin work as a preacher in a black only church. Many white people harassed the church and tried to hurt people who worked there, including Martin.
He also worked on a farm. He harvested plants and feed animals and breaded them. Martin was sick of working on the farm and wanted to become more powerful for his people.
Martin decided to take a stand. He made a speech in front of thousands of people. His famous quote was ""I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin."
After that speech nothing was the same. It changed peoples perspective of humans and race. Most people noticed that it doesn't matter the color of your skin, everyone is human,