The Vietic languages are a branch of the Austroasiatic language family, spoken by the Vietic peoples in Laos and Vietnam. The branch was once referred to by the terms Việt–Mường, Annamese–Muong, and Vietnamuong; the term Vietic was proposed by La Vaughn Hayes, who proposed to redefine Việt–Mường as referring to a sub-branch of Vietic containing only Vietnamese and Mường. Many of the Vietic languages have tonal or phonational systems intermediate between that of Viet–Muong and other branches of Austroasiatic that have not had significant Chinese or Tai influence. Vietnamese, today, has had significant Chinese influence especially in vocabulary and tonal system. Sino-Vietnamese vocabulary accounts for about 30–60% of Vietnamese vocabulary, not including calques from Chinese. Origins The ancestor of the Vietic language is traditionally assumed to have been located in today's North Vietnam. However, the origin of the Vietic languages remains a controversial topic among linguists. Another theory, based on linguistic diversity, locates the most probable homeland of the Vietic languages in modern-day Bolikhamsai Province and Khammouane Province in Laos as well as parts of Nghệ An Province and Quảng Bình Province in Vietnam. The time depth of the Vietic branch dates back at least 2,500 years to 2,000 years (Chamberlain 1998); 3,500 years (Peiros 2004); or around 3,000 years (Alves 2020). Even so, archaeogenetics demonstrated that before the Đông Sơn period, the Red River Delta's inhabitants were predominantly Austroasiatic: genetic data from Phùng Nguyên culture's Mán Bạc burial site (dated 1,800 BC) have close proximity to modern Austroasiatic speakers such as the Mlabri and Lua from Thailand, the Nicobarese from India (Nicobar Islands), and the Khmer from Cambodia; meanwhile, "mixed genetics" from Đông Sơn culture's Núi Nấp site showed affinity to "Dai from China, Tai-Kadai speakers from Thailand, and Austroasiatic speakers from Vietnam, including the Kinh"; therefore, "[t]he likely spread of Vietic was southward from the RRD, not northward. Accounting for southern diversity will require alternative explanations." Vietnamese The Vietnamese language was identified as Austroasiatic in the mid-nineteenth century, and there is now strong evidence for this classification. Modern Vietnamese has lost many Proto-Austroasiatic phonological and morphological features. Vietnamese also has large stocks of borrowed Chinese vocabulary. However, there continues to be resistance to the idea that Vietnamese could be more closely related to Khmer than to Chinese or Tai languages among Vietnamese nationalists. The vast majority of scholars attribute typological similarities with Sinitic and Tai to language contact