Why is Dorothy Gale the protagonist in 'The Wizard of Oz'?

Answer 1

That it contains the colors of the American flag when worn with the magical slippers is one reason why Dorothy's dress is special in "The Wizard of Oz."

No im sorry the slippers were not ruby...they were silver!

Answer 2

That she is the main character is the reason why Dorothy Gale is the protagonist in "The Wizard of Oz."

Specifically, the protagonist is the main character around whom all of the action centers and by whom the course of events is affected. The description fits Dorothy Gale. The storyline deals with what happens when she lands in the magical land of Oz and when she tries to leave.