The United Kingdom voted to leave the European Union in a referendum held on June 23, 2016. This event, commonly referred to as "Brexit," resulted in a significant political upheaval, leading to extensive debates on the implications for the UK, Europe, and global markets. The leave campaign, which emphasized sovereignty and reducing immigration, won with approximately 52% of the vote. Following the referendum, a protracted negotiation process began, culminating in the UK's formal exit from the EU on January 31, 2020. The decision has continued to influence UK politics, economics, and its relationship with European countries.