Living in an era when we can easily tweak the small (delete a sentence, crop an image) but feel helpless when facing the large (political turmoil, climate change), it’s hard not to fantasize about reworking our histories. But this inclination is not new. Attempting to rework the past, at least on paper, has been the outlet of artists and authors for as long as people have been wishing for different endings. “As If: Alternative Histories From Then to Now,” an exhibition at the Drawing Center, presents eighty-four works from 1888 to the present that “offer examples of how we might reimagine historical narratives in order to contend with the traumas of contemporary life.”