The Obama administration is spending close to a half a billion dollars to build a sophisticated electronic fence along Jordan's northern and eastern borders, a wall which US strategic planners hope will stem the flow of refugees and also wall off the increasingly important American base from the disintegration of Syria and Iraq. The wall, which began as a $20 million project in 2008 to erect a set of surveillance towers along a 30-mile (50 km) stretch of the border with Syria, has since expanded into a program costing half a billion dollars, according to defense officials who spoke to...