The launch forms part of events across the world, culminating in an annual Mandela Day lecture by former United States president Barack Obama in South Africa. "It will be aimed at young people in Africa and also around the world to show that we have been through darker times before and we can overcome these challenges to keep Mandela's vision alive".

The Democratic former USA president did not name his Republican successor, Donald Trump, but the speech was among the most pointed comments he has made about politics since leaving office in January 2017. "It's not wrong to insists national borders matter", Obama said.

"I can't find common ground if someone says climate change is just not happening when nearly all the world's scientists tell us it is".

The Nelson Mandela Centenary Exhibition celebrates Mandela's life.

Imprisoned for almost three decades for his fight against racial segregation, Mandela was freed in 1990 and quickly set about working to unite the nation through forgiveness and reconciliation, becoming South Africa's first black president.

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"Just by standing on the stage honoring Nelson Mandela, Obama is delivering an eloquent rebuke to Trump", said John Stremlau, professor of global relations at Witwatersrand University in Johannesburg, who called the timing auspicious as the commitments that defined Mandela's life are "under assault" in the USA and elsewhere.

Nelson Mandela, who spent 27 years in prison, is still celebrated as an inspirational figure for his views on world peace and freedom. Add Barack Obama as an interest to stay up to date on the latest Barack Obama news, video, and analysis from ABC News.

These movements, Obama said, have struck a chord among "people living outside the urban core who feel like security is slipping away, their social status and privileges eroding, their cultural identities threatened by outsiders".

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FILE PHOTO: South Africa's former president Nelson Mandela waits to meet Paralympics team at the Nelson Mandela foundation in Houghton, South Africa, October 3, 2008.

The former USA president suggested a different path."Let me tell you what I believe", he said.

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