Countries band together to promote trade, defend human rights, protect the environment and repel threats. They sign treaties and join international groups, and each time they do, they give up a bit of their own sovereignty as independent countries. That happened in a big way with the creation of the European Union, a free-trade zone and global political force forged from the fractious states of Europe. For the people of the United Kingdom, it was never an easy fit. In a June 2016 referendum, the