A vote by Britain to quit the European Union might reignite conflict in Northern Ireland because it would re-erect a border through the country, German Foreign Minister Frank-Walter Steinmeier said on Thursday. […] The minister said that an Irish representative had once told him that the conflict in Northern Ireland was currently quiet “because there are no borders in Ireland.” But if the United Kingdom were to quit the EU, “there will be a border again between Ireland and Northern Ireland. And that could at least have the potential of rekindling a conflict that has seemingly calmed down,” he said....