The US President has arrived in Argentina.
Barack Obama wants to reset diplomatic relations and strengthen trade ties with a country that was part of South America’s left-wing bloc until the free market Mauricio Macri took power last December.
Obama landed in Buenos Aires just after midnight local time and will meet Macri during the trip.
A state dinner is planned for the evening.
Left-wing activists have promised protests during the visit, which coincides with the 40th anniversary of the 1976 coup that installed a military junta.
To smooth over criticism of the trip, the US said last week it will declassify documents from that period in its history
Obama will also pay tribute to the victims of the regime.
His South American trip began in Cuba, the first visit by a US president for 88 years.
Tributes were paid to the victims of the Brussels attacks at a baseball match in the capital, Havana.