Leftist Congressman Gabriel Boric, 35, will become the youngest president in Chile’s history after winning a comfortable victory in the South American nation’s most polarized election since its return to democracy more than 30 years ago. With virtually all of the vote counted, the millennial progressive who burst into prominence a decade ago as a shaggy-haired student protest leader had garnered almost 56% of the ballots. That compared with about 44% for his opponent, José Antonio Kast, 55, a far-right career politician and admirer of Chile’s former military dictatorship. *** the results represented the latest triumph for the left in...