Vietnam is home to fifty-four official ethnic groups, the majority of which live in highland areas, although some large groups such the Cham or Chinese live in lowland or urban areas. Since the mid-1980s, relations between ethnic groups have generally been good, but conflict has been present. The most frequent problem is competition for resources, either between different highland groups or between highland groups and lowland groups that have settled in the midlands and highlands. Some minority group members also feel discriminated against and resent governmental intrusion in their lives. The government, which at one level supports and celebrates ethnic diversity, has had complicated relations with groups it fears might become involved in anti-government activities. This has been the case with several highland groups in northern and central Vietnam, the ethnic Chinese, many of whom fled Vietnam at the time of the Vietnam War and China's brief border war in 1979, and expatriate Vietnamese who have returned to Vietnam.