Three years after the British people voted in a referendum to leave the European Union, will Brexit (short for “British exit”) finally happen in 2019? The United Kingdom has a new pro-Brexit prime minister, Boris Johnson, and he’s vowed to complete the process with or without a trade deal with the E.U. to cushion the blow. But most British lawmakers are opposed to leaving without a deal and have passed a law to prohibit it. The standoff has made the future of Brexit more uncertain than ever.