In this Feb. 11, 2019, file photo, teachers carry placards as they walk a picket line outside South High School in Denver. Oakland teachers say they will strike starting Thursday, Feb. 21. The union representing the 3,000 teachers announced the walkout Saturday, Feb. 16, making it the latest in a wave of educator activism that has swept the U.S. since last spring. (AP Photo/David Zalubowski, File)
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