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Thousands of public school teachers rally outside the Chicago Public Schools district headquarters on the first day of strike action over teachers' contracts on Monday, Sept. 10, 2012 in Chicago. For the first time in a quarter century, Chicago teachers walked out of the classroom Monday, taking a bitter contract dispute over evaluations and job security to the streets of the nation's third-largest city — and to a national audience — less than a week after most schools opened for fall. (AP Photo/Sitthixay Ditthavong)

Thousands of public school teachers rally outside the Chicago Public Schools district headquarters on the first day of strike action over teachers' contracts on Monday, Sept. 10, 2012 in Chicago. For the first time in a quarter century, Chicago teachers walked out of the classroom Monday, taking a bitter contract dispute over evaluations and job security to the streets of the nation's third-largest city — and to a national audience — less than a week after most schools opened for fall. (AP Photo/Sitthixay Ditthavong)

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.