The unexpected result in the British referendum is hitting the news today like a thunderclap. As the financial markets tumble, few will escape Brexit’s consequences. But none will feel Brexit more than those whose employment and residential security have been contingent on the UK’s continued EU membership. An estimated 3 million citizens of other EU member states live in the UK. Meanwhile, 1.3 million Brits live in other EU member states. For this population, Brexit spells uncertainty, at least. No more will moving across the Channel for work, study, and other purposes be almost as easy as moving across the Hudson River from New York to New Jersey. Getting another nationality will in many cases be the answer. Think citizenship insurance. Free movement rights formerly guaranteed under the EU treaty regime will be up for grabs. Those who are allowed to stay will face visa applications, registration regimes, and other bureaucratic hassles. Others may face expulsion. As EU citizens – a status that comes with citizenship in an EU member state — these individuals have …