The Columbia River
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Portland is the name of major cities in Maine and in Oregon. However, it is not the name of the capital in either of those states (the capitals are: Augusta, Maine and Salem, Oregon). No state in the U.S. has Portland as its capital.
Oregon is a state, part of the 50 states that make up the United States of America. There is a city in Oregon called Oregon City. There are also cities in various states that are called Oregon, Ohio and Illinois for example. As far as I know there is no country called Oregon.
Oklahoma, Oregon, and Utah.
Lewis and Clark faced the Rocky Mountains during their exploration of Oregon and Washington. This mountain range presented a significant obstacle to their journey as they crossed over rugged terrain and navigated through mountain passes.
Oregon.
Oregon country became the complete states of Oregon, Washington, and Idaho, as well as parts of Montana, Wyoming, and British Columbia in Canada.
Oregon is a US State and does not contain other states.
The Columbia River forms a major part of the border between the states of Oregon and Washington.
The states are California, Oregon, and Washington (In the United States)
, the states that border Oregon are Washington(North of Oregon), Idaho(East of Oregon), Nevada(Southeast of Oregon) and California(South of Oregon). The Pacific Ocean is located on the West coast of Oregon.