President Donald Trump on Thursday signed an executive order to rename Lake Ontario “Lake America.” The move comes amid the president’s repeated threats and taunts that he would do so amid his escalating trade war with Canada. “This is official, effective immediately,” Trump said after signing the order in the Oval Office. The president said he’d “filed all the necessary papers, documents, everything else” for the name change. “We notified all of the various people that we have to notify. So we’ve done everything that you have to do, and this is official, effective immediately,” he said. The order says...