<Tr> <Td> Later Baekje </Td> <Td> 892--936 </Td> </Tr> <Tr> <Td> Taebong (Later Goguryeo) </Td> <Td> 901--918 </Td> </Tr> <Tr> <Td> Later Silla </Td> <Td> 668--935 </Td> </Tr> <Tr> <Th> Unitary dynastic period </Th> </Tr>

Why is korea divided into north and south korea