The history of Oregon may be considered in five eras: geologic history, inhabitation by native peoples, early exploration by Europeans (primarily fur traders), settlement by pioneers, and modern development. The term "Oregon" may refer to any of three phases: Oregon Country, a large region explored by Americans, British, and others (and generally known to Canadians as the Columbia District); the Oregon Territory, established by the United States two years after its sovereignty over the region was established by the Oregon Treaty, and before states were established in the Pacific Northwest; and the modern U.S. state of Oregon. (Oregon was also an early name for the Columbia River.)
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