ISIS was trained and funded by the Obama Administration supposedly with the naive hope that they would be allies of the US and overthrow the government of Syria.
Obama removed American troops from Iraq far more quickly than his advisers recommended leaving material unprotected.
But I doubt that it was just the incompetence of the Obama Administration. The Obama Administration has consistently supported the most violent and terrorist Muslim factions. In Libya they stormed our embassy and killed four Americans. In Egypt the Muslim Brotherhood was put into power by the Obama Administration before it was overthrown by the Egyptians. In Afghanistan they supported groups killing Americans and established rules of engagement the caused Americans to be killed. In Syria they armed and funded Islamist terrorists. In Africa they support violent Islamist groups like Boko Haram that murder Christians.
The Obama Administration id responsible for the increase in Muslim terrorism over the last few years.
Everything Obama has touched in the ME has become worse...