Following the surrender of Japan, in 1945, the Republic of Korea was adopted as the legal English name for the new country. Since the government only controlled the southern part of the Korean Peninsula, the informal term South Korea was coined, becoming increasingly common in the Western world. While South Koreans use Han (or Hanguk) to refer to the entire country, North Koreans and ethnic Koreans living in China and Japan use the term Joseon as the name of the country.