What evidence does the author provide for why Claudette Colvin's actions remain little known today?

The author feels that the activists of that time didn't feel like a teenager would be a good icon for a movement. So, Claudette Colvin's action still remain little known today.

Explanation:

Prior to Rosa parks, there were many black man and woman who refused to give up their bus seats. They were quietly fined and if they protested were punished and sent to jail. And Claudette Colvin was one of them. She was just fifteen when she was hurled into jail. And colvin's incident took place just nine month prior to Rosa parks. Her story is the subject of author Phil Hoose's book, where he talked about a fresh teen's struggle to end segregation.