China

China is the world's second-largest economy and home to one of humanity's oldest continuous civilisations, with a cultural heritage stretching back thousands of years and cities that range from ancient imperial capitals to futuristic megacities. The country strictly prohibits dual nationality, and those who naturalise are expected to formally renounce prior citizenship, making it a one-way transition. Despite limited passport mobility compared to its economic weight, China's rapid infrastructure development, technological advancement, and sheer scale of opportunity continue to attract foreign professionals, academics, and entrepreneurs.