The French language's decline was slower and occurred later than in Vietnam and Cambodia in Laos as the monarchy of Laos had close political relations with France. At the eve of the Vietnam War, the Secret War was beginning in Laos as political factions between communist Pathet Lao and the government occurred. Pathet Lao held areas used Lao as their sole language and following the end of the Vietnam War, French began its sharp decline in Laos. Additionally, many elite and French-educated Lao immigrated to nations such as the United States and France to escape government persecution. With the end of isolationism in the early 1990s however, the French language rebounded, thanks to the establishment of French, Swiss and Canadian relations and opening of French-language centers in central Laos. Today, French has a healthier status in Laos than the other Francophone nations of Asia and about 35% of all students in Laos receive their education in French, with the language being a required course in many schools. French is also used in public works in central and southern Laos and Luang Prabang and is a language of diplomacy and of the elite classes, higher professions and elders. However, the English language has continued to threaten the French language in Laos as it is seen as the language of international commerce and some schools have also made English a mandatory subject. Laos is also a member of La Francophonie.