<P> On February 14, 1859, the territory entered the Union as the U.S. state of Oregon within its current boundaries . The remaining eastern portion of the territory (the portions in present - day southern Idaho and western Wyoming) was added to the Washington Territory . </P> <Ul> <Li> Territorial evolution of the United States <Ul> <Li> International territory that would later become part of the Territory of Oregon: <Ul> <Li> Oregon Country, 1818--1846 <Ul> <Li> Provisional Government of Oregon, 1843--1849 (extralegal) </Li> </Ul> </Li> </Ul> </Li> <Li> U.S. territories that encompassed land that was previously part of the Territory of Oregon: <Ul> <Li> State of Deseret, 1849--1850 (extralegal) </Li> <Li> Territory of Washington, 1853--1889 </Li> <Li> Territory of Jefferson, 1859--1861 (extralegal) </Li> <Li> Territory of Nebraska, 1854--1867 </Li> <Li> Territory of Dakota, 1861--1889 </Li> <Li> Territory of Idaho, 1863--1890 </Li> <Li> Territory of Montana, 1864--1889 </Li> <Li> Territory of Wyoming, 1868--1890 </Li> </Ul> </Li> <Li> U.S. states that encompass land that was once part of the Territory of Oregon: <Ul> <Li> Oregon, 1859 </Li> <Li> Montana, 1889 </Li> <Li> Washington, 1889 </Li> <Li> Idaho, 1890 </Li> <Li> Wyoming, 1890 </Li> </Ul> </Li> </Ul> </Li> </Ul> <Li> Territorial evolution of the United States <Ul> <Li> International territory that would later become part of the Territory of Oregon: <Ul> <Li> Oregon Country, 1818--1846 <Ul> <Li> Provisional Government of Oregon, 1843--1849 (extralegal) </Li> </Ul> </Li> </Ul> </Li> <Li> U.S. territories that encompassed land that was previously part of the Territory of Oregon: <Ul> <Li> State of Deseret, 1849--1850 (extralegal) </Li> <Li> Territory of Washington, 1853--1889 </Li> <Li> Territory of Jefferson, 1859--1861 (extralegal) </Li> <Li> Territory of Nebraska, 1854--1867 </Li> <Li> Territory of Dakota, 1861--1889 </Li> <Li> Territory of Idaho, 1863--1890 </Li> <Li> Territory of Montana, 1864--1889 </Li> <Li> Territory of Wyoming, 1868--1890 </Li> </Ul> </Li> <Li> U.S. states that encompass land that was once part of the Territory of Oregon: <Ul> <Li> Oregon, 1859 </Li> <Li> Montana, 1889 </Li> <Li> Washington, 1889 </Li> <Li> Idaho, 1890 </Li> <Li> Wyoming, 1890 </Li> </Ul> </Li> </Ul> </Li> <Ul> <Li> International territory that would later become part of the Territory of Oregon: <Ul> <Li> Oregon Country, 1818--1846 <Ul> <Li> Provisional Government of Oregon, 1843--1849 (extralegal) </Li> </Ul> </Li> </Ul> </Li> <Li> U.S. territories that encompassed land that was previously part of the Territory of Oregon: <Ul> <Li> State of Deseret, 1849--1850 (extralegal) </Li> <Li> Territory of Washington, 1853--1889 </Li> <Li> Territory of Jefferson, 1859--1861 (extralegal) </Li> <Li> Territory of Nebraska, 1854--1867 </Li> <Li> Territory of Dakota, 1861--1889 </Li> <Li> Territory of Idaho, 1863--1890 </Li> <Li> Territory of Montana, 1864--1889 </Li> <Li> Territory of Wyoming, 1868--1890 </Li> </Ul> </Li> <Li> U.S. states that encompass land that was once part of the Territory of Oregon: <Ul> <Li> Oregon, 1859 </Li> <Li> Montana, 1889 </Li> <Li> Washington, 1889 </Li> <Li> Idaho, 1890 </Li> <Li> Wyoming, 1890 </Li> </Ul> </Li> </Ul>

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