Nulato on the Yukon River (of Koyukon homeland) and one (in the 1819 Copper Fort) at Taral (Russian Тарал, native Ahtna name Taghaelden) on the Copper River (of Ahtna homeland). British traders established Fort Yukon (of Gwich'in homeland) in 1847. Trade goods from these posts may have passed to Lower and Upper Tanana Athabaskans through intra-Native trade networks. Direct contact between Tanana Athabaskans and white traders increased after the 1860s. With the U.S. purchase of Alaska in 1867, control of trading stations and the fur trade passed to Americans. Through the 1880s, American traders established several additional posts on the Yukon and Tanana rivers, including locations at Nuklukayet (modern-day Tanana of Koyukon people homeland), Belle Isle (modern-day Eagle of Hän people homeland), and Fort Yukon. The Tanana River area has a documented Euroamerican history of less than 130 years, and like the Tanana Athabaskan history. The Nucha'la'woy'ya (or anglicized Nuchalawoya lit. 'where the two rivers meet') or Noochuloghoyet (lit «the point of the big river peninsula» and historically: Nukluroyit, Nuclavyette, Nukluklayet, Nukiukahyet, Nuklukait,, Nuklaciyat, Nuklukyat, Noukelakayet, Tuklukyet (modern-day Tanana) was a traditional trading settlement for Koyukon and Tanana Athabaskans long before European contact. With the beginning of Euro-American contact in Interior Alaska in the early 19th century, trade influences and influxes of new populations began to change life in the region. Land use patterns shifted from traditional indigenous uses to activities based on Euro-American economic and political systems. As Euro-American traders (merchants), miners, missionaries and explorers moved into the Tanana Valley, the traditional life ways of local Athabaskan groups were disrupted. Access to trade goods and the development of the fur trade not only affected traditional material culture, but also began to dramatically affect subsistence activities and settlement patterns. Similarly, the arrival of missionaries in the Alaskan Interior profoundly influenced traditional social organization. The introduction of mission schools for Native children and the doctrine of new religious beliefs contributed to an erosion of traditional ecological knowledge and other traditional practices. After the Alaska Purchase in 1867, most of the Koyukon were converted by either Catholic or Protestant denominations, and by 1900 virtually all Alaskan Athabaskans were Christians at least by name if not entirely by practice. An influenza epidemic in 1920 claimed one-fourth of the Lower Tanana Athabaskan population of Nenana (Toghotili). Hunting-gathering The homeland of Tanana Athabaskans is the Dfc climate type subarctic boreal forest of Nearctic realm, called