Restrictions on economic activity following reunification in 1975 and the subsequent but unrelated general deterioration in Vietnamese-Chinese relations sent chills through the Chinese-Vietnamese community.
The relation between China and Vietnam also declined in this period, with Vietnam siding with the Soviet Union against China in the Chinese-Soviet split.
About 30 groups of various cultures and dialects are spread over the highland territory.
Other minority groups include the Cham—remnants of the once-mighty Champa Kingdom, conquered by the Vietnamese in the 15th century, Hmong, and Tai ("Thái").
Vietnam's approximately 1 million ethnic Chinese, constitute one of Vietnam's largest minority groups.
The government now reports HIV cases in all provinces, 93 percent of all districts, and 49 percent of all communes, although many high prevalence provinces report cases in 100 percent of communes.They live in an area which was previously part of Cambodia and which Vietnam conquered in the 17th and 18th centuries.Official Vietnamese figures put the Khmer Krom at 1 million people.Another main cause of HIV/AIDS spread is sexual transmission through the sex workers.While 97.1% of female sex workers (FSW) reported using condoms with their most recent clients, While HIV/AIDS remain an epidemic only within the high-risk groups, women in the general population may be more exposed to the risk of contracting HIV than reported.