<Tr> <Td> 1850 </Td> <Td> 212,592 </Td> <Td> </Td> <Td>--</Td> </Tr> <Tr> <Td> 1860 </Td> <Td> 604,215 </Td> <Td> </Td> <Td> 184.2% </Td> </Tr> <Tr> <Td> 1870 </Td> <Td> 818,579 </Td> <Td> </Td> <Td> 35.5% </Td> </Tr> <Tr> <Td> 1880 </Td> <Td> 1,591,749 </Td> <Td> </Td> <Td> 94.5% </Td> </Tr>

Which of the following is not a region of texas