Dropping bombshells is always better than dropping literal bombs. But President Donald Trump’s pronouncement that “the U.S. will take over the Gaza Strip” may be too close for comfort. Standing next to Israel’s Prime Minister Benjamin Netanyahu, Trump laid out his new plan to take possession of the 140-square-mile strip of land, clear out the tens of millions of tons of debris caused by the 15-month Israel–Hamas war, and economically develop it through nation-building. “We’ll own it. And be responsible for dismantling all of the dangerous, unexploded bombs and other weapons on the site. Level the site, and get rid...