Question

Porque un representante del pueblo no podía ascender y pertenecer a la nobleza
Doy 100 puntos.

Answer 1

Because someone can not be, to belong to royalty he has to be appointed by king

Por que alguien  no puede ser, para pertenecer a la realeza tiene que ser designado por un rey

Answer 2

Maybe it's because she or he doesn't want to be or that's just not how the history is..(I know this types of stories..)