Just a couple months ago, the Middle East seemed to be calming down, at least a bit. But now the region is heating up again, and the U.S. is very deeply involved. NPR’s Greg Myre connects the dots.

Just a couple months ago, the Middle East seemed to be calming down, at least a bit. But now the region is heating up again, and the U.S. is very deeply involved. NPR’s Greg Myre connects the dots.