KABUL, Afghanistan – Some filed into schools to cast their ballots amid lessons still scrawled on blackboards. Others stepped over piles of shoes to vote in mosques. In remote areas, tents served as polling stations. Across Afghanistan, millions lined up at polling stations in defiance of a Taliban boycott call and militant attacks to vote for a new parliament Sunday. It was the last formal step in starting a democracy aimed at ending decades of rule by the gun. “Today is a magnificent day for Afghanistan,” said Ali Safar, 62, standing in line to vote in Kabul. “We want dignity,...