<Tr> <Td> </Td> <Td> 1854--1859 </Td> <Td> George L. Curry </Td> </Tr> <Tr> <Td_colspan="2"> History </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Oregon Treaty </Td> <Td> June 15, 1846 </Td> </Tr> <Tr> <Td> </Td> <Td> Organized </Td> <Td> August 14, 1848 </Td> </Tr>

What countries were involved in the oregon territory