The first Brexit actually happened thousands of years ago

Britain split from mainland Europe to become an island thanks to catastrophe — that might sound political, but in fact it’s geographic. Thousands of years before the UK opted to leave the European Union, a process called Brexit, a different separation occurred. Unlike the political one, it was relatively simple, and probably composed of just two stages.
First, a review of geography: England is separated from the rest of Europe by a body of water called the English Channel; the bit of