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Chicago teachers walk a picket line outside Benjamin Banneker Elementary School in Chicago, Monday, Sept. 10, 2012, after they went on strike for the first time in 25 years. Union and district officials failed to reach a contract agreement despite intense weekend negotiations. (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.