Obama's visit to Buenos Aires next week coincides with the 40th anniversary of the 1976 military coup that started Argentina's 1976-83 dictatorship. Little is known about the US role leading up to that period, in which thousands of people were forcibly disappeared and babies systematically stolen from political prisoners.
Susan Rice, Obama's national security adviser, said Obama would use his trip to announce a "comprehensive effort" to declassify more documents, at Argentina's request. She said Obama would also visit Remembrance Park in Buenos Aires to honor victims of the dictatorship.
The announcement promised to reverberate across Argentina, where even today the events of the dictatorship are a major topic of national interest and concern.
"This is transcendental. We believe it's a huge gesture," Marcos Pena, Argentine President Mauricio Macri's Cabinet chief, told local channel Todo Noticias.
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The US has previously released 4,000 State Department documents related to that period, but those documents tell only part of the story. Notes from a 1976 meeting between Secretary of State Henry Kissinger and Argentina's foreign minister, for example, seemed to show Kissinger urging his new counterpart to clamp down on dissidents they referred to as "terrorists."
In Argentina, human rights advocates have repeatedly called for the US to divulge the rest of the information it has in hopes of exposing any wrongdoing.
As part of the new declassification effort, the US will search for additional records related to rights abuses committed by the junta, said a senior Obama administration official, who wasn't authorized to discuss the program by name and requested anonymity. That search will for the first time include records from US intelligence agencies, along with the Pentagon, US law enforcement agencies and presidential libraries, the official said.
"This is also going to help in the search for grandchildren taken during the dictatorship," Avruj wrote on Twitter.