The one, two, three punch of The Immaculate Collection, The Blonde Ambition tour and Vogue. After that, she was solidified as the world's leading female pop icon.
The Immaculate Collection literally came and snatched.
This is the correct answer. The Immaculate Collection.
I honestly would think the take a bow moment before evita would be a marker of her legendary status but i can see the argument for Vogue before her backlash in the early 90s