The United Kingdom - A Developed Country with a rich long history and one of the largest growing economies in the world. With a GDP per capita well above 40,000 USD and a GDP over 3 Trillion USD, The United Kingdom certainly had the potential to break it into the top 3 largest economies in the world. But things haven't been going well in recent times for the UK. Firstly, BREXIT wreaked havoc for them, and Russia-Ukraine's war has added to the misery.