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Through Canada and President of the United States

The term "Oregon" may refer to:

  • Oregon Country (1818–1846), a large region in the Pacific Northwest and western North America explored, settled and temporarily jointly occupied by both Americans and the British (and generally known to Canadians as the Columbia District, prior to the formation of the Colony of British Columbia later becoming a western province in the Canadian Confederation in 1867 of the Dominion of Canada;
  • Oregon Territory (1848-1853/1859), established by the United States Congress and approved by the President, two years after its sovereignty over the southern portion of the region was established by the Oregon Treaty of June 1846, splitting the earlier Oregon Country with the northern portion going to Great Britain / future Canada. The northern and eastern portions were separated in 1853, becoming the new Washington Territory (up to its 42nd statehood as Washington state in 1889), and subsequently the eastern portion also separated a decade later becoming the Idaho Territory (1863–1890),then becoming the 43rd state of Idaho in 1890.
  • Oregon, a current U.S. state since the previous Oregon Territory (1848–1859) with its admission to the federal Union as the 33rd state in February 1859

The history of Oregon, and of the Pacific Northwest region, has received relatively less attention from historians, as compared to other regions of the American far west.

Geology

Volcanic activity in the region has been traced to 40 million years ago, in the Eocene era, forming much of the region's landscape. In the Pleistocene era (the last ice age, two million to 700,000 years ago), the Columbia River broke through Cascade Range, forming the Columbia River Gorge.

The Columbia River and its drainage basin experienced some of the world's greatest known floods toward the end of the last ice age. The periodic rupturing of ice dams at Glacial Lake Missoula resulted in discharge rates ten times the combined flow of all the rivers of the world, as many as forty times over a thousand-year period.

Water levels during the Missoula Floods have been estimated at 1,250 feet (380 m) at the Wallula Gap (in present-day Washington), 830 feet (250 m) at Bonneville Dam, and 400 feet (120 m) over current day Portland, Oregon. The floods' periodic inundation of the lower Columbia River Plateau deposited rich lake sediments, establishing the fertility that supports extensive agriculture in the modern era. They also formed many unusual geological features, such as the channeled scablands of eastern Washington.

Mount Mazama, once the tallest mountain in the region at 11,000 feet, had a massive volcanic eruption approximately 5677 B.C. The eruption, estimated to have been 42 times more powerful than the 1980 eruption of Mount St. Helens, reduced Mazama's approximate 11,000-foot (3,400 m) height by around half a mile (about 1 km) when much of the volcano fell into the volcano's partially emptied neck and magma chamber. Mazama's collapsed caldera, in today's southern Oregon, contains Crater Lake, and the entire mountain is located in Crater Lake National Park.

The Klamath Native Americans of the area thought that the mountain was inhabited by Llao, their god of the underworld. After the mountain destroyed itself the Klamaths recounted the events as a great battle between Llao and his rival Skell, their sky god.

The 1700 Cascadia earthquake resulted from a rupture at the Cascadia subduction zone along the coast of the Pacific Northwest. The earthquake caused a tsunami that was destructive in Japan; it may also be linked to the Bonneville Slide, in which a large part of Washington's Table Mountain collapsed into the Columbia River Gorge, damming the river and forming the Bridge of the Gods, a land bridge remembered in the oral history of local Native Americans.

Celilo Falls, a series of rapids on the Columbia River just upstream of present-day The Dalles, Oregon, was a fishing site for natives for several millennia. Native people traveled to Celilo Village from all over the Pacific Northwest and beyond to trade. The rapids were submerged in 1957 with the construction of The Dalles Dam.

In 1980, Mount St. Helens in nearby Washington erupted violently, temporarily reducing the Columbia River's depth to as little as 13 feet, and disrupting Portland's economy. The eruption deposited ash as far into Oregon as Bend.

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