"We played a pivotal role in forging a national unity government in Afghanistan that, while still facing challenges, has kept alive the chance for future progress," he said at his final press conference as the Secretary of State yesterday.
Kerry had played an instrumental role in the formation of the unity government led by President Ashraf Ghani and CEO Dr Abdullah Abdullah.
"We all know how difficult that could have been when an election had serious problems, and the country was poised to perhaps see the government fall apart and maybe even enter into civil war and yet we helped broker and pull together the parties into a unity government that still today is managing to move forward in Afghanistan," Kerry said.
Despite best efforts, the Obama administration has not been able solve all the global problems, Kerry acknowledged.
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"Obviously we have not solved every problem. The Israeli- Palestinian conflict continues, but we are absolutely right to support a two-state solution and to warn about the danger of actions on any side that could obstruct that possibility.
Kerry said that despite the US' best efforts to mobilise a unified response from the international community, and to ease tensions and reduce violence and save lives, obviously war has continued at considerable human cost.
"It is only through a political solution that ultimately the country can be unified, the country can be rebuilt, and the violence can actually be stopped. It is only through a political solution that actual peace can finally come to Syria," he said.
"That is why the US continues to support diplomatic efforts to achieve and effective cessation of hostilities and to transition to a government capable of uniting the Syrian people," he added.