(FILES) A poster featuring a Brexit vote ballot with "out" tagged is on display at a book shop window in Berlin on June 24, 2016. June 23, 2026 marks 10 years since the UK voted for Brexit, upending the country's politics and triggering fraught negotiations that finally concluded when it left the European Union in January 2020. Immigration, trade and the economy were all key issues during the Brexit campaign. (Photo by John MACDOUGALL / AFP via Getty Images)