It came as South Africans joined former USA president Barack Obama in marking the centennial of anti-apartheid leader Nelson Mandela's birth with acts of charity in a country still struggling with deep economic inequality 24 years after the end of white minority rule.
This was Obama's first trip to Africa since leaving office in 2017.
He noted that Mandela's "vision for an inclusive community is once again under attack in the USA and across the world", even as another former USA president Barack Obama at the 2018 Nelson Mandela annual lecture in Johannesburg declared, "we have to follow Madiba's example of persistence and of hope". "Nelson Mandela. On #MandelaDay, we honour @NelsonMandela's life and work that continues to inspire our world".
Mr Obama says he knew while he was still president that he wanted to return to Africa to help its young people build networks, as he says it is through networks that people are able to build communities and his foundation wants to help to bridge that gap.
Obama speaks to Nelson Mandela's widow Graca Machel during the memorial service for the former South African president at the FNB Stadium in Soweto near Johannesburg on December 10, 2013.
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Former US President Barack Obama decried mounting global inequality and the emergence of a political order based on fear and resentment, calling for greater efforts to foster worldwide cooperation as he delivered barbs at China and his successor in the White House.
Nelson Mandela International Day 2018 marked 100 years since the birth of Nelson Mandela (July 18, 1918).
Obama said "a politics of fear and resentment and retrenchment began to appear and that kind of politics is now on the move".
Obama pointed out that he was standing at this podium, more than a quarter century after Mandela walked out of prison, to say that "we are all human". In the photo, a much younger version of Aishwarya can be seen greeting Nelson Mandela at an event.
Since leaving the White House, Mr Obama has largely avoided direct involvement in U.S. politics and has refrained from criticising Mr Trump.
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In what was perhaps another allusion to Trump, he criticized leaders who "just make stuff up.when they're caught in a lie and they just double down".
Mandela is known for being "the epitome of civil action" after he was imprisoned for 27 years for attempting to end apartheid in Africa, a system of institutionalized segregation that existed in South Africa for years.
This house is very significant to the life of Nelson Mandela but also to the democracy of the country because it's here where Madiba spent his first 6 years after his presidency.
"Worse still, the documents demonstrate the FBI continued its wrong-headed Communist menace investigations of Mandela and the anti-apartheid movement even after USA imposition of trade sanctions against apartheid South Africa, after Mandela's globally-celebrated release from prison, and after the fall of the Berlin Wall". Obama is not expected to make any mention of his successor, President Donald Trump, said Ben Rhodes, Obama's longtime aide and adviser.
"Canada is deeply proud of its historical friendship with Nelson Mandela".
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The African Union (AU) said today that the legendary South African anti-apartheid fighter Nelson Mandela is an inspiration of service to humanity, based on the ideals of freedom, justice, equality, tolerance, and reconciliation.