If the current tensions in the trade talks between the United Kingdom and the European Union feel like a repetition of the 2019 disputes, when Britain negotiated its exit from the bloc, it’s because they are. Once more, a no-deal Brexit looms on the horizon, because unless Brussels and London reach an agreement, bilateral trade will happen under World Trade Organization tariffs starting next year. Like last year, both sides are exchanging threats and accusing each other of acting in bad faith. And, in the most notable deja vu from 2019, the status of Northern Ireland has reemerged as an obstacle to a deal. The explanation for this situation is simple: there are fundamental issues that the arrangements of 2019 left unresolved and have come back to jeopardize the negotiations in 2020. ...