<Tr> <Td> ← </Td> <Td> 1848--1859 </Td> <Td> → → </Td> </Tr> <Tr> <Td_colspan="3"> <P> </P> <P> Seal of the Oregon Territory </P> </Td> </Tr> <P> Seal of the Oregon Territory </P> <Tr> <Td_colspan="2"> Capital </Td> <Td> <Ul> <Li> Oregon City (1848--1851) </Li> <Li> Salem (1851--1855) </Li> <Li> Corvallis (1855) </Li> <Li> Salem (1855--1859) </Li> </Ul> </Td> </Tr>

When did the us gain some land claims in oregon