What will Obama's foreign policy legacy be?

President Obama gave his final address to the United Nations General Assembly Tuesday. He spent much of the speech talking about the need for international cooperation and diplomacy. He cited progress over the last eight years of his administration, including the Iran nuclear deal, the Paris Agreement to combat climate change, and the thawing of relations with Cuba. But he also recognized that challenges remain for the international community, particularly in finding a peaceful resolution to the conflict in Syria and doing more to accommodate millions of desperate refugees. How will the state of Syria affect Obama’s legacy? And will his predecessor carry on the policies he’s most proud of?