Chilean President Jose Antonio Kast wasted no time.Less than a week after his inauguration, Chile’s arch-conservative president on Monday began overseeing preparations to build a border barrier - part of his flagship campaign promise to block immigrants from crossing illegally.From Chile’s northern frontier area of Chacalluta, where legions of immigrants have slipped across the Peruvian border into one of the region’s most prosperous nations, Kast vowed to implement what he calls his “Border...