The United Kingdom of Great Britain and Northern Ireland, often referred to as the UK or Britain, is made up of the countries of England, Scotland, Wales, and Northern Ireland. The UK is a leading member of the G7, G20, and NATO, among other global organizations. . Services are by far the largest segment of the British economy. London, the country’s capital and largest city, is a global hub of financial and commercial services and cultural influence. The UK was an original member of the modern European Union, but retained the British Pound as its currency after the EU issued the euro. In 2016, the UK became the first country to leave the EU with its withdrawal formally complete at the end of 2020. With strong ties to the United States and Asia, a continuing relationship with the EU, and a highly organized and technologically advanced economy, the UK is a strategic location for international expansion into Europe.