France started by sending missionaries to Vietnam and in 1887, France made Indochina a French colony. Vietnam declared independence in 1954.
Colonization in the nineteenth century answers the "how" and "when" of Vietnam becoming French-speaking. The French arrived in southern Vietnam because of the counter-weights to British presence in East, South, and Southeast Asia and the earnings which could be had from plantation economies. The colonialists simultaneously established a countrywide system of educational and governmental facilities which quickly turned the Vietnamese peoples into bilingual speakers of French and Vietnamese.
England isn't a french speaking country...
Laos is a country in Asia where French is spoken as a second language due to its history of French colonization. It is one of the few Asian countries where French has official status alongside Lao.
French is spoken as an official language in several countries outside of Europe and Africa, including Canada, Haiti, and some countries in the Caribbean region like Martinique and Guadeloupe. Additionally, French is also spoken in countries in the Pacific region, such as French Polynesia and New Caledonia.
Louisiana became French-speaking due to its colonization by the French in the early 18th century. The French influence in Louisiana was further perpetuated by the Louisiana Purchase in 1803, which brought more French-speaking settlers to the region. Over time, French language and culture became ingrained in the state's identity.
There are no French-speaking countries in Asia. French-speaking countries are primarily located in Europe, Africa, and the Americas.
Egypt was colonized by France in 1798 under Napoleon Bonaparte's rule. While French influence declined after Egypt became a British protectorate, French remained an important language of diplomacy, education, and culture due to Egypt's history of colonization and shared cultural ties with France.
Cambodia started to adopt French as a second language during the French colonial period in the mid-19th century. French became more widely spoken and used in government and education until Cambodia gained independence in 1953.
France, Belgium, Switzerland, Algeria, Senegal, Madagascar, Canada, and Vietnam
Vietnam was formerly French Indochina, a French colony.
Vietnam
Quebec in Canada, some islands in the Carribeans (Haiti), France and French Guyana, Monaco, Belgium, Switzerland, Andorra, Polynesia Then you have a lots of countries with a French-speaking minority like Cambodia, Laos, Vietnam, Louisiana in the United States, etc...