Much like Hinduism, adherence to Islam in Vietnam is primarily associated with the Cham ethnic minority, although there is also a Muslim population of mixed ethnic origins, also known as Cham, or Cham Muslims, in the southwest (Mekong Delta) of the country. Islam is assumed to have come to Vietnam much after its arrival in China during the Tang Dynasty (618–907), through contact with Arab traders. The number of followers began to increase as contacts with Sultanate of Malacca broadened in the wake of the 1471 collapse of the Champa Kingdom, but Islam would not become widespread among the Cham until the mid-17th century. In the mid-19th century, many Muslims Chams emigrated from Cambodia and settled in the Mekong Delta region, further bolstering the presence of Islam in Vietnam.