The Syrian civil war (if that's what you're referring to) is a result of the Arab Spring that started in 2010 in reaction to low standards of living in Tunisia, which spread to amongst others Syria.

That's the wiki summary anyway, which doesn't directly implicate the US or any particular president.

That said, general unrest in the middle-east can be attributed to meddling from the US that has been going on for decades, from the founding of the State of Israel in 1948, the US funding the Afghans during the Soviet/Afghan war, to the first and second gulf war, the Saudis, etc.

While I don't like Obama's policy when it came to the conflicts down there, he inherited it from decades of policy.

While it's fun to blame the US for all the problems in the world ever, in the middle east lets not forget the heart of the serious issues are largely a result of European colonialism at the turn of the 20th century. And then they made a bunch of "mandates", peaced out, and left everything in shambles..

Is Syria considered its own conflict? Many reporters have considered it an extension of the Iraq War, due to the Iraq War's impact on ISIS/ISIL.