BOSTON—More than three centuries after a Massachusetts woman was wrongly convicted of witchcraft and sentenced to death, she’s finally on the verge of being exonerated—thanks to a curious eighth-grade civics class. State Sen. Diana DiZoglio, a Democrat from Methuen, has introduced legislation to clear the name of Elizabeth Johnson Jr., who was condemned in 1693 at the height of the Salem Witch Trials but never executed. DiZoglio says she was inspired by sleuthing done by a group of 13- and 14-year-olds at North Andover Middle School. Civics teacher Carrie LaPierre’s students painstakingly researched Johnson and the steps that would need to be taken to make sure she was formally pardoned. “It is important that we work to correct history,” DiZoglio said Wednesday. “We will never be able to change what happened to these victims, but at the very least, we can set the record straight.” If lawmakers approve the measure, …