A patchwork of tent tops are spread across Mexico City's main plaza, the Zocalo, where protesting teachers have erected a vast tent encampment, Friday Aug. 23, 2013. Thousands of striking teachers ... more 
A patchwork of tent tops are spread across Mexico City's main plaza, the Zocalo, where protesting teachers have erected a vast tent encampment, Friday Aug. 23, 2013. Thousands of striking teachers strangled traffic and also blocked access to Mexico City's international airport on Friday, flexing their muscles in a bid to block educational reforms intended to introduce teacher evaluations and reduce union power over hiring decisions. (AP Photo/Gabriela Sanchez) less 
1 / 31
Associated Press | Photo By Gabriela Sanchez
Wed, Aug 28, 2013 5:07 PM EDT