Mexico's President-elect Andres Manuel Lopez Obrador speaks at a rally commemorating the 50th anniversary of a bloody reprisal against students, at the Tlatelolco Plaza in Mexico City, Saturday, Sept. 29, 2018. Lopez Obrador vowed Saturday to never use military force against civilians. Troops fired on a peaceful demonstration at the plaza on Oct. 2, 1968, killing as many as 300 people at a time when leftist student movements were taking root throughout Latin America. (AP Photo/Christian Palma)
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