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...
Vietnam. Because of French colonial rule, lots of people in Vietnam, particularly older people, speak French as a second language. It is a Francophone county.
Outside of Europe and Africa, the French-speaking countries are Cambodia, Laos, Vietnam, French Guyana, and Canada (though mostly in Quebec).
Louisiana was once a French colony.
The four former French colonies in Asia are Cambodia, Laos, Pondicherry [in India], and Vietnam.
Some Egyptians speak French. Napoleon invaded Egypt and French was also the language of diplomacy. However, Egypt is an Arab speaking country, not a French speaking country.
Cambodia became a French-speaking country when France colonized it in 1863 and imposed the French language on the Cambodian people.
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...