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Parents of Chicago public school students, Carmen Brownlee, left, and, Latonya Williams, right, walk a picket line outside Shoop Elementary School in support of striking CPS teachers, Tuesday, Sept. 11, 2012. This is the second day of a strike in the nation's third-largest school district as negotiations by the two sides failed to reach an agreement Monday in a bitter contract dispute over evaluations and job security. (AP Photo/M. Spencer Green)

Chicago teachers end strike

Chicago teachers

voted on Sept. 18 to suspend a seven-day strike in the nation's third-largest city, a

move that will send thousands of students back to classrooms.