How does Butler present ideas from their past works in Undoing Gender? How do they convey change or evolution of their own ideas?

In the Introduction, Butler expands the range of their arguments to include sex, gender, sexuality, race, and colonialism. Why are these fields intertwined in the process of “undoing” gender? Is Butler trying to “undo” more than gender?

Though Butler includes some review of their theory of gender performativity, much of gender as performance is assumed in this text. Identify one of Butler’s arguments in the text. How does the background of gender performativity inform their ideas?