After some long negotiations, the teachers in the third largest school district in the country have failed to come to a new contract deal, and have walked out of their classrooms.

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NBC Chicago reports that for the first time in 25 years, there is a work stoppage in the city of Chicago. Now, more than 300,000 students have been left without teachers.

The contract negotiations took a very ugly turn late Sunday, when the school boards would not agree to health benefits, salary or job security for the teachers. The union president, Karen Lewis, said that it was a hard decision to reach, but it had to be done.