The first people to live in the area, the Spokane tribe (their name meaning "children of the sun" in Salishan), lived off plentiful game. David Thompson explored the area with the westward expansion and establishment of the North West Company's Spokane House in 1810. This trading post was the first long-term European settlement in Washington. Completion of the Northern Pacific Railway in 1881 brought settlers to the Spokane area. The same year it was officially incorporated as a city under the name of "Spokane Falls" (it was reincorporated under its current name ten years later). In the late 19th century, gold and silver were discovered in the Inland Northwest. The local economy depended on mining, timber, and agriculture until the 1980s. Spokane hosted the first environmentally themed World's Fair at Expo '74.