Members of the Mothers of Plaza de Mayo human rights group demand information about missing relatives during their traditional Thursday march in Buenos Aires on March 3. The women began demonstrating in 1977.
President Obama's visit to Argentina this week coincides with the anniversary of a dark moment in that country's history. Thursday marks 40 years since a 1976 military coup that ushered in that country's so-called Dirty War, when as many as 30,000 Argentines were killed or disappeared during a seven...
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