The key factor that stood out in the UK’s decision was the failure of Cameron’s effort to secure key reforms in negotiations with EU leaders at a meeting in February, 2016. The campaign for Brexit was backed by the message “taking back control.” Approximately four years later, the UK officially left the Union, but faced significant changes. Although they regained control of their borders, trade agreements, and immigration policy, this meant losing access to the EU single market; meaning new trade barriers and adjustments to their economy. Furthermore, some saw Brexit as a cause to worry for more countries exiting, while others saw it as a chance for European Union reform. Overall, Brexit had a heavy impact on Britain and Europe. In the first time in the EU’s history, this was the first time a country had left, leading to a disruption in European integration that had been alive for decades.