1. I think Margaret Bourke-White would use it, but not in extreme ways. She might have used it to touch up a few things, like with the brightness and contrast. I do not think she would totally manipulate and change the photo because her style was all about exposing the scene for what it really was. She wanted to show the truth.
2. No, I do not think she would have used it to try and get her meanings across better because her photos already got her message across without editing. She was also all about exposing the truth behind every situation.
3. Yes, because she captured the truth behind the photographs. She didn't change or manipulate them. She showed the photos that were meant to be shown and there is no way to duplicate her photos.