https://portside.org/2017-12-18/rosa-parks-revisited

'Parks explained that “I had felt for a long time, that if I was ever told to get up so a white person could sit, that I would refuse to do so.”

'That day came on Dec. 1, 1955, when a bus driver asked her to get up so that a white man could sit. She refused. This was not a spur-of-the-moment decision. It was a political calculation informed by a life of activism. As Parks put it, “an opportunity was being given to me to do what I had asked of others.”

And the idea that sh'e stayed seated because of physical fatigue is pure fiction. '