The story of 国语 (Guóyǔ) is a story of modern Chinese history. In the early 20th century, the Republic of China (ROC) sought to unify a vast country speaking hundreds of mutually unintelligible dialects. They established a standard national language based on the Beijing dialect and called it 国语. After the Chinese Civil War concluded in 1949, the ROC government relocated to Taiwan, bringing 国语 with them. It became the official language of the island. Meanwhile, the new government in Mainland China, the People's Republic of China (PRC), also promoted a standard language based on the Beijing dialect but eventually named it 普通话 (Pǔtōnghuà), meaning “common speech.” This historical split is the key to understanding the term.