US President Barack Obama offered Argentina help in pursuing the perpetrators of the 1994 bombing of the AMIA Jewish center in Buenos Aires.
Despite efforts to keep the focus on the future, Obama's visit has been clouded by a renewed look at Argentina's past and questions about America's role in the Argentina's 1976 military coup and the dictatorship that followed.
"Following the gruesome terrorist attacks in Brussels earlier this week, President Obama chose to continue gallivanting across the communist country of Cuba with the Castros". It is nearly 20 years since a USA president made a formal visit to Argentina.
Mr. Obama, who has pledged to declassify USA military and intelligence files from that era, said the US "has to examine its own policies as well, and its own past".
World leaders have a long and reasonably upsetting history when it comes to dancing in public, however President Barack Obama may have just bucked this trend.
Macri, who has committed Argentina to a pro-business approach, was equally effusive about Obama, who leaves office in less than a year.
President Obama showed off his dancing skills during his trip to Argentina.
"A memorial like this speaks to the responsibility that we all have", Obama said in a speech shortly afterwards.
'There is no more important item on my agenda than going after them and defeating them, ' Obama said.
Mr Obama's presence in Argentina on the 40th anniversary of the coup on Thursday was deemed insensitive by left-wing groups, which called for a protest in the streets of Buenos Aires.
Obama's visit to Argentina coincided with the 40th anniversary of a right-wing military coup, which the USA government condoned and which ushered in the dictatorship.
U.S. President Barack Obama, right, and his Cuban counterpart Raul Castro wave to cheering fans as they arrive for a baseball game between the Tampa Bay Rays and the Cuban national baseball team, in Havana, Cuba, Tuesday, March 22, 2016. The tour comes amid a wider push to reset the United States' relationship with Latin America. While their parents attended the state dinner, Malia and Sasha Obama enjoyed dinner in a Peruvian-Japanese fusion cuisine restaurant.
Then Obama and his family planned to fly to Bariloche, a picturesque city in southern Argentina, for a few hours of leisure before departing late Thursday for Washington.