Yukon (formerly the Yukon Territory) is one of Canada's three territories in the country's extreme northwest. Its history of human habitation dates back to the Ice Age, and the original inhabitants are believed to have arrived over 20,000 years ago by migrating over the land bridge from Asia. In the 18th century, Russian explorers began trade with the First Nations people along the Alaskan coast, beginning the establishment of trade relations throughout the region. The famous Klondike Gold Rush began after gold was discovered near Dawson City in 1896. As a result of the influx of people looking for gold, it was made a separate territory in 1898, split off from the Northwest Territories. The second major event in the Yukon's history is the construction of the Alaska Highway during the Second World War, for the transportation of war supplies. Eventually Whitehorse became the largest city in the Yukon, and then the capital in 1953.
Disputed evidence of the oldest remains of human inhabitation in North America have been found in the Yukon. A large number of apparently human-modified animal bones were discovered in the Old Crow area in the northern Yukon that have been dated to 25,000–40,000 years ago by carbon dating. The central and northern Yukon were not glaciated, as they were part of Beringia.
At about 800, a large volcanic eruption in Mount Churchill near the Alaska border blanketed the southern Yukon with ash. That layer of ash can still be seen along the Klondike Highway. Yukon First Nations stories speak of all the animals and fish dying as a result. Similar stories are told among the Athabaskan-speaking Navajo and Apache, leading to the conclusion by some anthropologists that the migration of Athabaskan peoples into what is now the southwestern United States could have been due to the eruption. After that, the hunting technology saw the replacement of atlatls with bows and arrows.