An American journalist held for nearly two years by an al-Qaida affiliate in Syria was freed yesterday. This comes less than a week after another American journalist, James Foley, was beheaded by ISIS. That’s the militant group now calling itself the Islamic State, which has gained ground in Iraq in recent weeks. The group is said to be holding three other Americans captive. To thwart ISIS, the U.S. has conducted limited airstrikes in Iraq, and it has been pressing the Iraqi government to do more. But the Obama administration is under growing pressure to strike ISIS on Syrian soil. A discussion of U.S. strategy to combat ISIS.