WASHINGTON (AP) — In a campaign that spanned five years and two U.S. presidencies, unleashed more than 100,000 bombs and killed untold numbers of civilians, the U.S. military engineered the destruction of the Islamic State group's self-proclaimed empire in Iraq and Syria.

That's a military success, but not necessarily one that will last.

The Islamic State group is down, but it is not done.

President Donald Trump on Wednesday flashed a color-coded map to illustrate what he called the imminent demise of IS in its last speck of Syrian territory. At its peak, in 2014-15, it controlled an area the...