Obama's visit to Argentina on the 40th anniversary of the coup that opened the "Dirty War" met protests—but he pledged to release files on US complicity in the atrocities.
Brazil has seen its biggest protests since the end of the dictatorship as ex-president "Lula" da Silva is appointed to a cabinet post that gives him immunity in a corruption scandal.
Riot police fired rubber bullets and tear-gas at protesting public-sector workers laid off by budget cuts mandated under new President Mauricio Macri in Argentina's La Plata.
Brazilian mining company Samarco agreed to pay $260 million after waste dams were breached at its facility, flooding nearby villages with toxic mud.
Residents in the Argentine town of Famatina celebrated a major victory as La Rioja provincial authorities announced cancellation of a gold mine project following local protests.
Police troops broke up a roadblock at San Juan Jáchal, Argentina, where residents are mobilizing in the wake of last month's cyanide spill at Barrick Gold's Veladero mine.
Thousands of protesters marched on government offices in Argentina's Chaco province after housing advocate Angel Verón died from wounds sustained in a beating by police.
A peaceful march against a gold mine in Argentina's La Rioja province was dispersed by police using tear-gas and rubber bullets to enforce a court order barring protests at the site.
Mapuche indigenous leaders in Chile are expressing outrage over the violent eviction of protesters who were occupying a government office in the southern region of Araucania.
Residents of a town in northwest Argentina took to the streets in protest after a pipe carrying cyanide to Barrick Gold's Veladero mine fractured and spilled its contents in the area.
Indigenous Mapuche residents blocked access to oil and gas wells to press demands over territorial rights, nearly shutting down production in Argentina's Neuquén province.
Amnesty International charges that Brazil's military police have been responsible for more than 1,500 deaths in Rio de Janeiro's favelas in the last five years.
