David Cameron, the former Prime Minister of United Kingdom, announced his resignation from the post in June 2016, following the results of the Brexit referendum. His decision shocked the country and the world and triggered a chain of events that would redefine British politics. Cameron, who had led the Conservative Party to victory in the 2015 general elections, had promised to hold a referendum on the UK's membership in the European Union. However, he had hoped that the people would vote to remain in the EU and strengthen Britain's ties with the continent. He campaigned hard for the "Remain" side, warning of the economic risks of leaving the EU and projecting a positive future for Britain in the European Union. However, on June 23, 2016, the UK voted to leave the EU by a margin of 52% to 48%, shocking the political establishment and putting Cameron's leadership in doubt. The Prime Minister, who had staked his reputation on the outcome of the referendum, immediately announced his resignation, saying that the country needed new leadership to negotiate the terms of Brexit and to lead the UK into a new era. Cameron's decision to resign was seen by many as a courageous move, as he had been Prime Minister for six years and had won two general elections, establishing himself as one of the most successful Conservative leaders in decades. However, he recognized that his vision of a Britain that was strong and prosperous within the EU had been rejected by the people and that a new leader was needed to navigate the country through the uncertain waters of Brexit. The decision also signaled the end of an era in British politics, as Cameron had been a central figure in the country's political landscape for many years. He had been an MP since 2001, serving as Leader of the Opposition from 2005 to 2010 before becoming Prime Minister in 2010. He had brought a modern, youthful approach to the Conservative Party and had succeeded in broadening its appeal to voters who had previously rejected the Tories as being too elitist and out of touch. Cameron's resignation opened the door for a new leader of the Conservative Party and Prime Minister, and the race to succeed him was fierce. Theresa May, the Home Secretary, emerged as the frontrunner and was eventually elected as the new Prime Minister in July 2016. May, who had campaigned for the "Remain" side but had kept a low profile during the referendum campaign, promised to deliver Brexit and to unite the country behind a new vision for the UK. She also faced the challenge of holding together a deeply divided Conservative Party, as many MPs continued to debate the best way forward for Britain in the post-Brexit world. In conclusion, David Cameron's resignation as Prime Minister of the United Kingdom in June 2016 was a pivotal moment in British politics, triggered by the result of the Brexit referendum. His decision to step down was a recognition of the need for new leadership to guide the country through the challenges of leaving the European Union and to forge a new path for Britain. Cameron's legacy as Prime Minister may be contested, but his resignation marked the end of a political era and set the stage for a new chapter in Britain's history.