Language
As contact with the West grew, the Quoc Ngu system of Romanized writing was developed in the 17th century by Portuguese and other Europeans involved in proselytizing and trade in Vietnam. When France invaded Vietnam in the late 19th century, French gradually replaced Chinese as the official language in education and government. However, the Romanized script did not come to predominate until the beginning of the 20th century, when education became widespread and a simpler writing system was found more expedient for teaching and communication with the general population.
History of Vietnamese language
While spoken by the Vietnamese people for millennia, written Vietnamese did not become the official administrative language of Vietnam until the 20th century. For most of its history, the entity now known as Vietnam used written classical Chinese for governing purposes, whereas written Vietnamese in the form of Chu Nom was used for poetry and literature. It was also used for administrative purposes during the brief Ho and Tay Son Dynasties. During French colonialism, French superseded Chinese in administration. It was not until independence from France that Vietnamese was used officially. It is the language of instruction in schools and universities and is the language for official business.