<Tr> <Td> </Td> <Td> Agreement signed </Td> <Td> 12 December 1981 </Td> </Tr> <Tr> <Td> </Td> <Td> Established </Td> <Td> 1 February 1982 </Td> </Tr> <Tr> <Td> </Td> <Td> Disestablished </Td> <Td> 30 September 1989 </Td> </Tr> <Tr> <Td_colspan="3"> <Table> <Tr> <Td> Preceded by </Td> <Td> Succeeded by </Td> </Tr> <Tr> <Td> <Table> <Tr> <Td> </Td> <Td> Senegal </Td> </Tr> <Tr> <Td> </Td> <Td> The Gambia </Td> </Tr> </Table> </Td> <Td> <Table> <Tr> <Td> Senegal </Td> <Td> </Td> </Tr> <Tr> <Td> The Gambia </Td> <Td> </Td> </Tr> </Table> </Td> </Tr> </Table> </Td> </Tr>

Describe what makes senegal and gambia a confederal nation