The U.K.’s border with Ireland has been a major sticking point since Britain started negotiating its exit from the European Union. WSJ’s Jason Douglas traveled to the country’s only land frontier to understand why the issue is so divisive. Video: George Downs; Illustration: Jaden Urbi/Soarscape (Originally published Oct. 15, 2019) BRUSSELS—British Prime Minister Boris Johnson said there was a strong possibility that negotiations over a new trade agreement with the European Union would fail as the European Commission set out contingency plans to maintain basic rail, air and freight links between the U.K. and the bloc in case talks collapse. Both sides are preparing for significant border disruption on Jan. 1 affecting trade worth close to $900 billion a year, along with personal and business travel, as the U.K.’s current commercial and security ties with the bloc fall away on Jan. 1. New obstacles at the frontier would be […]