The killing of an unarmed black teenager by a white police officer in Ferguson, Missouri, in August prompted riots and soul-searching as America confronted the uglier side of its multi-ethnic society.
The unrest also handed a propaganda gift to authoritarian regimes in places such as Russia, Iran, China and North Korea, which are more used to being criticised for their dismal human rights records.
State media in all those countries were unable to disguise their schadenfreude as police officers in full combat gear confronted demonstrators in the suburbs of middle America.
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