What does Mary Warren do that significantly affects the storyline of The Crucible?

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Mary Warren's crucial switch from John Proctor's encouragement of truthful testimony to the manipulative pretense of the girls dramatically shifts the entire play. While John has Mary testifying that her previous involvement with the girls was done in order to pretend, the play appears to be moving in the direction...

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Mary Warren's crucial switch from John Proctor's encouragement of truthful testimony to the manipulative pretense of the girls dramatically shifts the entire play. While John has Mary testifying that her previous involvement with the girls was done in order to pretend, the play appears to be moving in the direction of justice. After Abby leads the girls to mock Mary's every word, Mary can't help but cave to peer pressure and she too joins their terrible cries of accusation. This results in John Proctor being quickly discredited and therefore jailed.

Put simply, Mary switches sides. Without her switch, there may have been a chance to put an end to this hysterical witch hunt.

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