<Table> <Tr> <Td> </Td> <Td> Northern Nigeria Protectorate </Td> </Tr> <Tr> <Td> </Td> <Td> Southern Nigeria Protectorate </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Northern Nigeria Protectorate </Td> </Tr> <Tr> <Td> </Td> <Td> Southern Nigeria Protectorate </Td> </Tr> <Table> <Tr> <Td> Federation of Nigeria </Td> <Td> </Td> </Tr> </Table>

When did the federal military government abolish the four regions in nigeria