Because she knew many of the leaders of colonial America...

[RonPurewal]

this is already addressed at length in the thread.

[jabgt]

'and'—unless it is followed by 'thus', 'so', 'yet', or some other connecting word(s)—suggests two separate and independent things.

more on this here:
https://www.manhattanprep.com/gmat/foru ... ml#p115627

Based on exactly the same issue "and", the correct answer E seems not all right. Should it be "and thus this vantage point"?

Thank you!

[RonPurewal]

the latter part of the sentence is about the combination of the "vantage point" and ms. warren's writing talent (while the first part has nothing to do with her writing ability).

that's a new enough idea to merit the use of "and".