In 1955, in the small Alabama town of Montgomery, this small Black woman (Rosa Parks) was on a bus. One White man got on the bus and wanted to sit at the front. He said to Rosa:

"go at the back of the bus, I want to sit at the front"

"No" said Rosa, "I don't want to give up my seat to a White person".

Later, Rosa said that on that day, she felt the force of all her Black ancestors in the USA who suffered and worked very hard with much humiliation. Rosa just wanted to say "no" to White people after three centuries of bad treatments and injustice! Rosa was arrested: in the south, Black people were obliged to give up their seats to White people on buses, or Black people had to go to cinemas for Blacks, or to restaurants for Blacks. This was "segregation" (=official racism)...

It was not the first time a Black person resisted White power in the American south, but this time, one man came and began the "Montgomery bus boycott". This man was Martin Luther King.