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TOPSHOT - Demonstrators march to commemorate the 55th anniversary of the Tlatelolco student massacre in Mexico City, on October 2, 2023. The Tlatelolco massacre commemorates when Mexican Armed Forces opened fire on student demonstrating against the 1968 Olympics Games to be hosted by Mexico -- one of the darkest episodes in a year of global turbulence. (Photo by Rodrigo ARANGUA / AFP) (KEYSTONE/AFP/RODRIGO ARANGUA)