<Table> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Flag </Td> <Td> Coat of arms </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Flag </Td> <Td> Coat of arms </Td> </Tr> <Tr> <Td_colspan="2"> Government </Td> <Td> Organized incorporated territory </Td> </Tr>

When did the united states claim the area west of the mississippi river