presence of the San in Botswana is particularly evident in northern Botswana's Tsodilo Hills region. San were traditionally semi-nomadic, moving seasonally within certain defined areas based on the availability of resources such as water, game animals, and edible plants. Peoples related to or similar to the San occupied the southern shores throughout the eastern shrubland and may have formed a Sangoan continuum from the Red Sea to the Cape of Good Hope. From the 1950s through to the 1990s, San communities switched to farming because of government-mandated modernization programs. Despite the lifestyle changes, they have provided a wealth of information in anthropology and genetics. One broad study of African genetic diversity, completed in 2009, found that the genetic diversity of the San was among the top five of all 121 sampled populations. Certain San groups are one of 14 known extant "ancestral population clusters"; that is, "groups of populations with common genetic ancestry, who share ethnicity and similarities in both their culture and the properties of their languages". Despite some positive aspects of government development programs reported by members of San and Bakgalagadi communities in Botswana, many have spoken of a consistent sense of exclusion from government decision-making processes, and many San and Bakgalagadi have alleged experiencing ethnic discrimination on the part of the government. The United States Department of State described ongoing discrimination against San, or Basarwa, people in Botswana in 2013 as the "principal human rights concern" of that country. Society The San kinship system reflects their history as traditionally small mobile foraging bands. San kinship is similar to Eskimo kinship, which uses the same set of terms as in European cultures, but adds a name rule and an age rule for determining what terms to use. The age rule resolves any confusion arising from kinship terms, as the older of two people always decides what to call the younger. Relatively few names circulate (approximately 35 names per sex), and each child is named after a grandparent or another relative, but never their parents. Children have no social duties besides playing, and leisure is very important to San of all ages. Large amounts of time are spent in conversation, joking, music, and sacred dances. Women may be leaders of their own family groups. They may also make important family and group decisions and claim ownership of water holes and foraging areas. Women are mainly involved in the gathering